Question: During which period Dame Mary Ethel Hughes GBE's husband hold the responsibility of administering the Department of the Prime Minister and Cabinet?
Context: Dame Mary Eugenia Charles, DBE (15 May 1919 – 6 September 2005) was a Dominican politician who was Prime Minister of Dominica from 21 July 1980 until 14 June 1995.  She was Dominica's first, and to date only, female prime minister, as well as the nation's longest-serving prime minister.  She was the second female prime minister in the Caribbean after Lucina da Costa of the Netherlands Antilles, and the first woman elected in her own right as head of government in the Americas.  She was the world's third longest-serving female Prime Minister, behind Indira Gandhi of India and Sirimavo Bandaranaike of Sri Lanka, and the world's longest continuously serving female Prime Minister ever.  Charles was also Dominica's first female lawyer. The Cabinet of Malaysia is the executive branch of Malaysia's government.  Led by the Prime Minister, the cabinet is a council of ministers who are accountable collectively to the Parliament.  According to the Article 43 of the Constitution, members of the Cabinet can only be selected from members of either houses of Parliament.  Formally, the Yang di-Pertuan Agong appoints all Ministers on the advice of the Prime Minister.  The constitution is amended by repealing the Clause (8) of Article 43, enabling a person who is a member of State Legislative Assembly to continue to be one even when he or she is appointed as a minister or deputy minister in the cabinet.  Ministers other than the Prime Minister shall hold office during the pleasure of the Yang di-Pertuan Agong, unless the appointment of any Minister shall have been revoked by the Yang di-Pertuan Agong on the advice of the Prime Minister but any Minister may resign his office.  In practice, the Yang di-Pertuan Agong is obliged to follow the advice of the Prime Minister on the appointment and dismissal of ministers. The Deputy Prime Minister of Croatia (officially the Vice President of the Government of the Republic of Croatia (Croatian: "Potpredsjednik/ Potpredsjednica Vlade Republike Hrvatske" )), is the official Deputy of the Prime Minister of Croatia.  Article 109 of the Constitution of Croatia states that the cabinet is to be made up of the Prime Minister, one or more Deputy Prime Ministers and other cabinet ministers.  According to convention, if the governing parliamentary majority is a coalition of parties, all junior partners in the coalition will usually be given one Deputy Prime Minister in the cabinet, with their rank usually being determined by the number of MPs the party has in Parliament.  The Deputy Prime Ministers are permitted to simultaneously hold a ministerial portfolio while in office, but may also serve without holding such a portfolio. The Prime Minister of the United Kingdom is the head of the Government of the United Kingdom, and chairs Cabinet meetings.  There is no specific date when the office of Prime Minister first appeared, as the role was not created but rather evolved over a period of time.  The term was used in the House of Commons in 1805 and it was certainly in parliamentary use by the 1880s, and in 1905 the post of Prime Minister was officially given recognition in the order of precedence.  Modern historians generally consider Sir Robert Walpole, who led the government of Great Britain from 1721 to 1742, as the first Prime Minister.  Walpole is also the longest-serving Prime Minister by this definition.  However, Sir Henry Campbell-Bannerman was the first Prime Minister and Margaret Thatcher the longest-serving Prime Minister to have been officially referred to as such. The Prime Minister of the Commonwealth of Australia is the head of government of Australia.  The individual who holds the office is the most senior Minister of the Crown, the leader of the Cabinet and the chairperson of the National Security Committee.  The Prime Minister also has the responsibility of administering the Department of the Prime Minister and Cabinet.  The office is not mentioned in the Constitution of Australia and exists only through longstanding political convention and tradition.  Despite this, in practice it is the most powerful parliamentary position in Australia.  The individual who holds the office is commissioned by the Governor-General of Australia. The Chief Cabinet Secretary of Japan (内閣官房長官 , naikaku-kanbō-chōkan ) is a Minister of State who is responsible for directing the Cabinet Secretariat of Japan.  The main function of the Chief Cabinet Secretary is to coordinate the policies of ministries and agencies in the executive branch.  The Chief Cabinet Secretary serves as the government's press secretary, conducts policy research, prepares materials to be discussed at cabinet meetings, and, in time of national crisis, coordinates ministries and agencies of the executive branch.  The Chief Cabinet Secretary is customarily nominated as the first in line to serve as temporary Acting Prime Minister in case the Prime Minister is unable to serve due to death or other grave reasons until a new Prime Minister is appointed.  The Chief Cabinet Secretary's office is located on the fifth floor of the Prime Minister's official residence in Tokyo. The Swedish constitution of 1974 allows the Prime Minister of Sweden to appoint one of the Ministers in the cabinet as Deputy Prime Minister ("biträdande statsminister", also unofficially known as "vice statsminister", "Vice Prime Minister"), in case the Prime Minister for some reason is prevented from performing his or her duties.  However, if a Deputy Prime Minister has not been appointed, the Minister in the cabinet who has served the longest time (and if there are several with equal experience the one who is oldest) takes over as head of government.  Note that the person acting as Prime Minister does not do so on a permanent basis: if a Prime Minister dies, resigns or loses a vote of confidence in the Riksdag, the Speaker of the Riksdag will then confer with the parties of the Riksdag and propose a new Prime Minister, who must be tolerated by a majority of the Riksdag.  If the Prime Minister has resigned or lost a vote of confidence, he or she will remain the head of a government "ad interim" until the new Prime Minister assumes his or her office.  The only case where the governmental line of succession becomes relevant is when the Prime Minister dies (upon which the person next in the line of succession serves as the head of a government "ad interim") or when the Prime Minister is on leave or for any other reason incapable of serving, but still remains in office.  This might be compared to the Presidential line of succession in the United States, where the person next in line assumes the Presidency throughout the remainder of the term if the President dies, resigns or is impeached. Dame Mary Ethel Hughes GBE (née Campbell; 6 June 18742 April 1958) was the second wife of Billy Hughes, Prime Minister of Australia from 1915 to 1923.  She was the daughter of a well-to-do grazier, and grew up in country New South Wales.  She married Hughes in 1911, when she was 37 and he was 48; their only daughter was born in 1915. Israeli Prime Minister's Office (Hebrew: משרד ראש הממשלה‎ ‎ ) is the governmental ministration office with the responsibility of coordinating the actions of the work of all governmental ministry offices, on various matters, and serving and assisting the Israeli Prime Minister in his daily work.  Among other things, it is responsible for formulating the Israeli cabinet's policy, conducting its cabinet meetings, as well as responsible for the foreign diplomatic relations with countries around the world, and supervising and overseeing the implementation of the Cabinet's policy.  In addition, it is in charge of other governmental bodies, which are directly under the Prime Minister responsibilities.  Unlike many other countries, the Office of the Prime Minister of Israel does not serve as his residence place as well, and in addition to his daily work office, he resides elsewhere, at the official residence of the prime minister in Beit Aghion. The Cabinet Secretary was a former title conferred on an Australian minister responsible for assisting the Prime Minister to manage the day-to-day procedural and operational matters of the Cabinet and any Cabinet committees.  As per all other ministers in the Westminster system, the Cabinet Secretary was a sitting member of Parliament, chosen by the Prime Minister and officially appointed by the Governor-General.  The Cabinet Secretary was a portfolio minister of the Department of the Prime Minister and Cabinet and existed at various stages between 2007 and 2017, when the position was abolished.
Answer: 1915 to 1923