Princess Frederica Amalia of Denmark
Princess Frederica Amalia of Denmark and Norway (11 April 1649 – 30 October 1704) was the second daughter of King Frederick III of Denmark and Sophie Amalie of Brunswick-Lüneburg, and Duchess of Holstein-Gottorp from 1667 to 1695 as the consort of Duke Christian Albert.
Agnes II, Abbess of Quedlinburg
Agnes II( Agnes of Meissen; 1139 – 21 January 1203) was a member of the House of Wettin who reigned as Princess- Abbess of Quedlinburg.
Adelaide II, Abbess of Quedlinburg
Adelaide II( 1045 – 11 January 1096), a member of the Salian dynasty, was Abbess of Gandersheim from 1061 and Abbess of Quedlinburg from 1063 until her death.
Hedwig, Abbess of Quedlinburg
Hedwig of Saxony( 31 October 1445 – 13 June 1511) was Princess- Abbess of Quedlinburg from 1458 until her death.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
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.
Marie Elisabeth, Abbess of Quedlinburg
Duchess Marie Elisabeth of Schleswig-Holstein-Gottorp (21 March 1678 – 17 July 1755) was Princess-Abbess of Quedlinburg from 1718 until her death.
Duchess Marie Elisabeth was born in Hamburg as the youngest child of Christian Albert, Duke of Holstein-Gottorp, and his wife, Princess Frederica Amalia of Denmark.
She was considered for marriage to Charles XII of Sweden, but he declined.
In 1718, she was elected Princess-Abbess of Quedlinburg.
However, the Kings in Prussia, who obtained the guardianship of the abbey-principality as electors of Brandenburg in 1698, tried to impose their authority over this small state of the Holy Roman Empire by attempting to influence the election of new princess-abbess in favour of their own relatives.
Marie Elisabeth was elected several times during the interregnum, while the abbey-principality was ruled by the provost Maria Aurora von Königsmarck, but King Frederick William I of Prussia refused to consent to each election and Holy Roman
Emperor Charles VI consequently refused to confirm the elections.
The election, however, eventually went ahead but the selection of a duchess of Schleswig-Holstein-Gottorp instead than a princess of Prussia caused quite a stir.
Due to her territorial disputes with the King in Prussia, Marie Elisabeth turned to the Holy Roman Emperor, but without success.
As the ruler, Princess-Abbess Marie Elisabeth restored the castle, the abbey and the Abbey Church of St. Servatius, where she was buried upon her death in Quedlinburg.
After her death, a princess of Prussia was finally elected and Marie Elisabeth was succeeded by Princess Anna Amalia of Prussia.
Adelaide I, Abbess of Quedlinburg
Adelaide I( 973/74 – 14 January 1044 or 1045), a member of the royal Ottonian dynasty was the second Princess- abbess of Quedlinburg from 999, and Abbess of Gernrode from 1014, and Abbess of Gandersheim from 1039 until her death, as well as a highly influential kingmaker of medieval Germany.
Marie Elisabeth zu Mecklenburg
Marie Elisabeth, Duchess of Mecklenburg (24 March 1646 - 27 April 1713) was a princess of Mecklenburg-Schwerin.
In 1712, following the unplanned late pregnancy and ensuing resignation of the formidable incumbent, , Marie Elisabeth became Princess Abbess of Gandersheim Abbey, but she died the next year.

Question: Who is the maternal grandmother of Marie Elisabeth, Abbess Of Quedlinburg?
Answer: Sophie Amalie of Brunswick-Lüneburg