Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Purnima (Hindi actress)
Purnima Das Verma( born Meherbhano Mohammad Ali) was an Indian film actress who worked predominantly in Hindi language films.
She is the grandmother of actor Emraan Hashmi.
Mona Hopton Bell
Mona Hopton Bell( 1867- 1940) was a British artist, best known for her portraits of civic figures.
She was the grandmother of the painter Jean H. Bell.
Anne Denman
Anne Denman( 1587–1661) was born in Olde Hall, Retford, Nottinghamshire.
Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne.
Kaoru Hatoyama
After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama.
Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.
Diana Guardato
Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan Carlos
I of Spain, 17th- Great Grandmother of Philippe of Belgium, 14th- Great Grandmother of His Majesty Manuel II of Portugal, 16th- Great Grandmother of Grand Duke Henri, as well as many others.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Ubol Ratana
Princess Ubol Ratana (born 5 April 1951) is a member of the Thai royal family.
She is the eldest child of King Bhumibol Adulyadej and Queen Sirikit.
In 1972, she married American citizen Peter Ladd Jensen and settled in the United States, losing her royal title in the process.
The couple divorced in 1998
whereupon she resumed her royal duties and position within the Thai court.
She is styled in English as "Princess Ubol Ratana", without the style "Her Royal Highness".
In 2001, she permanently returned to Thailand after a series of visits in the years following her divorce.
Almost immediately, she began to fulfill her royal duties by taking part in many ceremonies.
She started many charitable foundations that focused on improving the quality of life for the disadvantaged.
In February 2019, in an "unprecedented" move, Ubol Ratana announced her candidacy for Prime Minister of Thailand in the 2019 general election, running as a candidate of the Thaksin-allied Thai Raksa Chart Party.
Later that same day, her younger brother King Vajiralongkorn issued an emergency royal decree stating that her candidacy is "inappropriate" and "unconstitutional".
Thailand’s election commission then disqualified her from running for prime minister, formally putting an end to her candidacy.
Ploypailin Jensen
Than Phu Ying Ploypailin Mahidol Jensen (born February 13, 1981) is a member of the Thai Royal Family, a granddaughter of King Bhumibol Adulyadej of Thailand and a niece of King Vajiralongkorn of Thailand.
She is the eldest offspring of Princess Ubolratana Rajakanya of Thailand.
Ploypailin is not in the line of succession to the throne of Thailand as her mother relinquished her royal title when she married Ploypailin's American father, Peter Ladd Jensen.

Question: Who is the maternal grandmother of Ploypailin Jensen?
Answer: Sirikit