Question: Who is Mary, Crown Princess of Denmark's mother-in-law?

full_context: Document 1: House of Monpezat: The House of Laborde de Monpezat (] ) is a French family, known since the seventeenth century, associated with the Danish Royal Family by marriage after 1967, when Henri de Laborde de Monpezat wed Princess Margrethe of Denmark, heir presumptive of the ruling House of Glücksburg. In the event of ascension to the Danish throne of their son or male-line descendant, the main branch of the Danish Royal Family will belong patrilineally to the "Laborde de Monpezat" lineage. However, it is unclear which name the royal family will use in this event.
Document 2: Princess Isabella of Denmark: Princess Isabella of Denmark, Countess of Monpezat (Isabella Henrietta Ingrid Margrethe; born 21 April 2007), is the second child and elder daughter of Crown Prince Frederik and Crown Princess Mary.
Document 3: Succession to the Danish throne: The Danish Act of Succession, adopted on 27 March 1953, restricts the throne to those descended from Christian X and his wife, Alexandrine of Mecklenburg-Schwerin, through approved marriages. Succession is governed by absolute primogeniture.
Document 4: Crown prince: A crown prince or crown princess is the heir apparent to the throne in a royal or imperial monarchy. The wife of a crown prince is also styled crown princess.
Document 5: Pavlos, Crown Prince of Greece: Pavlos, Crown Prince of Greece, {'1': ", '2': ", '3': 'RE', '4': "} (Greek: Παύλος ; born 20 May 1967) is the eldest son and second child of Constantine II, the last King of Greece from 1964 to 1973 and his wife, Anne-Marie of Denmark. Pavlos was heir apparent to the throne of Greece and was its crown prince from birth, remaining so during his father's reign until the monarchy's abolition.
Document 6: John Dalgleish Donaldson: John Dalgleish Donaldson (born 5 September 1941) is a Scottish-Australian professor and the father of Mary, Crown Princess of Denmark, the wife of the heir apparent to the throne of Denmark, Frederik, Crown Prince of Denmark.
Document 7: Catherine, Duchess of Cambridge: Catherine, Duchess of Cambridge (Catherine Elizabeth "Kate"; "née" Middleton; born 9 January 1982) is the wife of Prince William, Duke of Cambridge. Following his father Charles, Prince of Wales, William is second in line to succeed his grandmother, Queen Elizabeth II, as monarch of the United Kingdom and 15 other Commonwealth realms, making Catherine a likely future queen consort.
Document 8: Princess Josephine of Denmark: Princess Josephine of Denmark, Countess of Monpezat (Josephine Sophia Ivalo Mathilda; born 8 January 2011), is the fourth and youngest child of Crown Prince Frederik and Crown Princess Mary, and the seventh grandchild of Queen Margrethe II of Denmark and her husband, Henrik, Prince Consort of Denmark. She is the twin sister of Prince Vincent of Denmark.
Document 9: Princess Benedikte of Denmark: Princess Benedikte of Denmark, Princess of Sayn-Wittgenstein-Berleburg {'1': ", '2': ", '3': 'RE, SKmd, D.Ht.', '4': "} (Benedikte Astrid Ingeborg Ingrid, born 29 April 1944) is the second daughter of King Frederick IX of Denmark and Ingrid of Sweden. She is the younger sister of the reigning Queen of Denmark, Margrethe II, and the older sister of Queen Anne-Marie of Greece.
Document 10: Frederik, Crown Prince of Denmark: Frederik, Crown Prince of Denmark, Count of Monpezat, {'1': ", '2': ", '3': 'RE, SKmd', '4': "} (Frederik André Henrik Christian; born 26 May 1968) is the heir apparent to the throne of Denmark. Frederik is the elder son of Queen Margrethe II and Henrik, the Prince Consort.
Document 11: Margrethe II of Denmark: Margrethe II (Danish: "Margrethe 2." , ] ; Faroese: "Margreta 2." ; Greenlandic: "Margrethe II" ; full name: "Margrethe Alexandrine Þórhildur Ingrid"; born 16 April 1940) is the Queen of Denmark. She is also the supreme authority of the Church of Denmark and Commander-in-Chief of the Danish Defence. Born into the House of Glücksburg, a royal house with origins in Northern Germany, she was the eldest child of Frederick IX of Denmark and Ingrid of Sweden. She succeeded her father upon his death on 14 January 1972, having had become heir presumptive to her father in 1953, when a constitutional amendment allowed women to inherit the throne. On her accession, Margrethe became the first female monarch of Denmark since Margaret I, ruler of the Scandinavian kingdoms in 1375–1412 during the Kalmar Union. In 1967, she married Henri de Laborde de Monpezat, with whom she has two sons: Crown Prince Frederik (born 1968) and Prince Joachim (born 1969). She has been on the Danish throne for 45 years, becoming the second-longest-reigning Danish monarch after her ancestor Christian IV.
Document 12: Princess Elisabeth of Denmark: Princess Elisabeth of Denmark, {'1': ", '2': ", '3': 'RE', '4': "} ("Elisabeth Caroline-Mathilde Alexandrine Helena Olga Thyra Feodora Estrid Margrethe Désirée"; born 8 May 1935 in Copenhagen) is the daughter of Hereditary Prince Knud and Hereditary Princess Caroline-Mathilde of Denmark, and is a first cousin of the present Danish monarch, Queen Margrethe II.
Document 13: Prince Vincent of Denmark: Prince Vincent of Denmark, Count of Monpezat (Vincent Frederik Minik Alexander; born 8 January 2011), is the third child and younger son of Crown Prince Frederik and Crown Princess Mary, the sixth grandchild and youngest grandson of Queen Margrethe II and Prince Henrik, and the twin brother of Princess Josephine.
Document 14: Mary, Crown Princess of Denmark: Mary, Crown Princess of Denmark, Countess of Monpezat, {'1': ", '2': ", '3': 'R.E.', '4': "} (Mary Elizabeth; "née" Donaldson; born 5 February 1972) is the wife of Frederik, Crown Prince of Denmark. Frederik is the heir apparent to the throne, which means that should Frederik succeed, she will automatically become Queen of Denmark.
Document 15: Haakon, Crown Prince of Norway: Haakon, Crown Prince of Norway (] ; Haakon Magnus; born 20 July 1973) is the only son and younger child of King Harald V and heir apparent to the throne of Norway.
ground_truth: Queen Margrethe II