Question: When did Princess Alexandra Of Saxe-Coburg And Gotha's mother die?

Context paragraphs:
title: Friedrich Josias, Prince of Saxe-Coburg and Gotha
paragraph_text: Friedrich Josias, Prince of Saxe- Coburg and Gotha( Friedrich Josias Carl Eduard Ernst Kyrill Harald; 29 November 1918 – 23 January 1998) was the head of the Ducal Family of Saxe- Coburg and Gotha and titular Duke of Saxe- Coburg and Gotha from 1954 until his death.
title: Kelly Rondestvedt
paragraph_text: Kelly, Hereditary Princess of Saxe- Coburg and Gotha, Duchess of Saxony( born Kelly Jeanne Rondestvedt on 10 January 1975) is an American investment banker. Through her marriage to Hubertus, Hereditary Prince of Saxe- Coburg and Gotha, the heir apparent to the defunct ducal throne of Saxe- Coburg and Gotha, she is a princess of the House of Saxe- Coburg and Gotha.
title: Grand Duchess Maria Alexandrovna of Russia
paragraph_text: Grand Duchess Maria Alexandrovna of Russia (later Duchess of Edinburgh and Duchess of Saxe-Coburg and Gotha; ; – 24 October 1920) was the fifth child and only surviving daughter of Emperor Alexander II of Russia and his first wife, Princess Marie of Hesse and by Rhine. She was the younger sister of Alexander III of Russia and the paternal aunt of Russia's last emperor, Nicholas II. In 1874 Grand Duchess Maria Alexandrovna married Prince Alfred, Duke of Edinburgh, the second son of Queen Victoria and Prince Albert of Saxe-Coburg and Gotha; she was the only Romanov to marry into the British royal family. The couple had five children: a son, Alfred, and four daughters: Marie, Victoria Melita, Alexandra, and Beatrice. For the first years of her marriage, Maria Alexandrovna lived in England. She neither adapted to the British court nor overcame her dislike for her adopted country. She accompanied her husband on his postings as an Admiral of the Royal Navy at Malta (1886–1889) and Devonport (1890–1893). The Duchess of Edinburgh travelled extensively through Europe. She visited her family in Russia frequently and stayed for long periods in England and Germany attending social and family events. In August 1893 Maria Alexandrovna became Duchess of Saxe-Coburg and Gotha when her husband inherited the duchy on the death of his childless uncle, Ernest II, Duke of Saxe-Coburg and Gotha. She enjoyed life in Germany, where she became active in cultural endeavours and charitable work. To her daughters she gave every support, but she was critical of her wayward son, who died young in 1899. Her husband died the following year. In her widowhood Maria Alexandrovna continued to live in Coburg. The outbreak of World War I divided her sympathies. She sided with Germany against her native Russia. Her only surviving brother, Grand Duke Paul Alexandrovich, her nephew Tsar Nicholas II and many other relatives were killed during the Russian Revolution and she lost her considerable fortune. From 1893 until her death, she had the distinction of being an Imperial Russian grand duchess (by birth), a British royal Duchess (by marriage), and the consort (and later widow) of a German sovereign Duke. After World War I, Saxe-Coburg-Gotha, the duchy which her husband and nephew had ruled, ceased to exist in November 1918. Maria Alexandrovna died two years later while living under reduced circumstances in exile in Switzerland.
title: Princess Dorothea of Saxe-Coburg and Gotha
paragraph_text: Princess Dorothea Maria Henriette Auguste Louise of Saxe-Coburg and Gotha (30 April 1881 – 21 January 1967) was a princess of Saxe-Coburg and Gotha  by birth and the duchess of Schleswig-Holstein  through her marriage to Ernst Gunther, duke of Schleswig-Holstein. Dorothea was born in Vienna, Austria, the second child and only daughter of Prince Philipp of Saxe-Coburg and Gotha and Princess Louise of Belgium.
title: Princess Teresa Cristina of Saxe-Coburg and Gotha
paragraph_text: Princess Teresa Cristina of Saxe- Coburg and Gotha( 23 August 1902 – 24 January 1990), was a German princess of the House of Saxe- Coburg and Gotha.
title: Prince August Leopold of Saxe-Coburg and Gotha
paragraph_text: Prince August Leopold of Saxe- Coburg and Gotha( December 6, 1867 – October 11, 1922), known in Brazil as Dom Augusto Leopoldo, was a prince of the Empire of Brazil and of the House of Saxe- Coburg and Gotha- Koháry. He was the second of four sons born to German Prince Ludwig August of Saxe- Coburg and Gotha and Princess Leopoldina of Brazil. The second grandson of the Emperor Pedro II, the prince was, for some years between the presumptive heirs to the Imperial Crown of Brazil. Their descendants would form the Saxe- Coburg and Gotha branch of the Imperial House of Brazil.
title: Hubertus, Hereditary Prince of Saxe-Coburg and Gotha
paragraph_text: Hubertus Michael, Hereditary Prince of Saxe- Coburg and Gotha, Duke of Saxony( born 16 September 1975) is the heir- apparent of the head of the family which ruled the Duchy of Saxe- Coburg and Gotha until 1918.
title: Andreas, Prince of Saxe-Coburg and Gotha
paragraph_text: Andreas, Prince of Saxe- Coburg and Gotha, Duke of Saxony( given names:" Andreas Michael Friedrich Hans Armin Siegfried Hubertus"; born 21 March 1943) has been the head of the House of Saxe- Coburg and Gotha since 1998. He is the grandson of Charles Edward, the last ruling duke of Saxe- Coburg and Gotha.
title: Alfred, Duke of Saxe-Coburg and Gotha
paragraph_text: Alfred( Alfred Ernest Albert; 6 August 184430 July 1900) reigned as Duke of Saxe- Coburg and Gotha from 1893 to 1900. He was the second son and fourth child of Queen Victoria of the United Kingdom and Prince Albert of Saxe- Coburg and Gotha. He was known as the Duke of Edinburgh from 1866 until he succeeded his paternal uncle Ernest II as the reigning Duke of Saxe- Coburg and Gotha in the German Empire.
title: Princess Alexandra of Saxe-Coburg and Gotha
paragraph_text: Princess Alexandra of Saxe-Coburg and Gotha, , (Alexandra Louise Olga Victoria; 1 September 1878 – 16 April 1942), was the fourth child and third daughter of Alfred, Duke of Saxe-Coburg and Gotha and Grand Duchess Maria Alexandrovna of Russia. She was a granddaughter of Queen Victoria of the United Kingdom as well as of Tsar Alexander II of Russia.

Reasoning steps:
Princess Alexandra of Saxe-Coburg and Gotha mother Grand Duchess Maria Alexandrovna of Russia
Grand Duchess Maria Alexandrovna of Russia date of death 24 October 1920

Answer: spans: 24 October 1920