Question: Who was the third daughter of the Earl Curzon of Kedleston?

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Viscount Scarsdale: Viscount Scarsdale, of Scarsdale in the County of Derby, is a title in the Peerage of the United Kingdom.  It was created in 1911 for the prominent Conservative politician and former Viceroy of India George Curzon, 1st Baron Curzon of Kedleston, who was created Earl Curzon of Kedleston at the same time and was later made Marquess Curzon of Kedleston.

Kedleston Hall: Kedleston Hall is an English country house in Kedleston, Derbyshire, approximately four miles north-west of Derby, and is the seat of the Curzon family whose name originates in Notre-Dame-de-Courson in Normandy.  Today it is a National Trust property.

Mary Curzon, Baroness Curzon of Kedleston: Mary Victoria Curzon, Baroness Curzon of Kedleston, CI (27 May 187018 July 1906) was a British peeress of American background who was Vicereine of India, as the wife of Lord Curzon of Kedleston, Viceroy of India.  As Vicereine of India, she held the highest official title in history of any American woman up to her time.

Grace Curzon, Marchioness Curzon of Kedleston: Grace Elvina Curzon, Marchioness Curzon of Kedleston, GBE ("née" Trillia Hinds; 16 May 1885 – 29 June 1958) was a United States-born British marchioness and the second wife of George Curzon, British parliamentarian, cabinet minister, and former Viceroy of India.

Irene Curzon, 2nd Baroness Ravensdale: Mary Irene Curzon, 2nd Baroness Ravensdale, CBE (20 January 1896 – 9 February 1966) was the eldest child of George Curzon, 1st Marquess Curzon of Kedleston and Mary Victoria Leiter, a daughter of Levi Ziegler Leiter.

Lady Curzon's peacock dress: Lady Curzon's peacock dress was a gown made of gold and silver thread designed by Jean-Philippe Worth for Mary Curzon, Baroness Curzon of Kedleston to celebrate the 1902 coronation of King Edward VII at the second Delhi Durbar in 1903.

Under-Secretary of State for Foreign Affairs: The Parliamentary Under-Secretary of State for Foreign Affairs has been a junior position in the British government since 1782, subordinate to both the Secretary of State for Foreign Affairs and since 1945 also to the Minister of State for Foreign Affairs.  The post has been based at the Foreign and Commonwealth Office, which was created in 1968, by the merger of the Foreign Office, where the position was initially based, and the Commonwealth Office.  Notable holders of the office include Granville Leveson-Gower, 2nd Earl Granville, John Wodehouse, 1st Earl of Kimberley, Edward Grey, 1st Viscount Grey of Fallodon, George Curzon, 1st Marquess Curzon of Kedleston, and Anthony Eden.  The current holders are Alistair Burt and Henry Bellingham.

Lady Alexandra Curzon: Lady Alexandra Naldera Curzon, CBE (20 March/April 1904 – 7 August 1995), was the third daughter of George Curzon, 1st Marquess Curzon of Kedleston and Viceroy of India, and Lord Curzon's first wife, the American mercantile heiress, Mary Victoria Curzon, Baroness Curzon of Kedleston (née Leiter).  She was named after her godmother, Queen Alexandra and her place of conception, Naldehra, India.  She and her two older sisters were memorialized by Anne de Courcy in "The Viceroy's Daughters: The Lives of the Curzon Sisters".

All Saints Church, Kedleston: All Saints Church, Kedleston, is a redundant Anglican church standing adjacent to Kedleston Hall, a country house in Derbyshire, England.  It is recorded in the National Heritage List for England as a designated Grade I listed building.  Kedleston Hall is owned by the National Trust, and the church is under the care of the Churches Conservation Trust.  Kedleston Hall has been occupied by the Curzon family for over 700 years.

George Curzon, 1st Marquess Curzon of Kedleston: George Nathaniel Curzon, 1st Marquess Curzon of Kedleston (11 January 1859 – 20 March 1925), known as The Lord Curzon of Kedleston between 1898 and 1911 and as The Earl Curzon of Kedleston between 1911 and 1921, was a British Conservative statesman.

Supporting paragraphs: Lady Alexandra Curzon George Curzon, 1st Marquess Curzon of Kedleston
Answer: Lady Alexandra Naldera Curzon