Question: Princess Marie-Cécile of Prussia, is the daughter of Louis Ferdinand, Prince of Prussia, and his wife, Grand Duchess Kira Kirillovna of Russia, maternally, she is a granddaughter of who was later titled, Grand Duchess Victoria Feodorovna of Russia, who is the he third child and second daughter of Alfred, Duke of Saxe-Coburg and Gotha?
Context: Grand Duchess Maria Kirillovna of Russia, (2 February 1907 – 25 October 1951) was the eldest daughter of Grand Duke Kirill Vladimirovich of Russia and Grand Duchess Victoria Feodorovna.  She was born in Coburg when her parents were in exile because their marriage had not been approved by Tsar Nicholas II.  She was generally called "Marie," the French version of her name, or by the Russian nickname "Masha."  The family returned to Russia prior to World War I, but was forced to flee following the Russian Revolution of 1917. 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 Edinburgh 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. Princess Kira of Prussia (Kira Auguste Viktoria Friederike; 27 June 1943 – 10 January 2004) was the fourth child and second daughter of Louis Ferdinand, Prince of Prussia and Grand Duchess Kira Kirillovna of Russia. Emich was born at Coburg, Weimar Republic, the first child of Karl, Prince of Leiningen (1898–1946), (son of Emich, 5th Prince of Leiningen and Princess Feodore of Hohenlohe-Langenburg) and his wife, Grand Duchess Maria Kirillovna of Russia (1907–1951), (daughter of Cyril Vladimirovich, Grand Duke of Russia and Princess Victoria Melita of Saxe-Coburg and Gotha).  Through his mother, he was a descendant of Queen Victoria and Tsar Alexander II.  Through his father, he was a descendant of the Vasa kings of Sweden and of both of Queen Victoria's half-siblings, Carl, Prince of Leiningen and The Princess of Hohenlohe-Langenburg.  As a result, Emich was the first descendant of all three of Victoria, Duchess of Kent's children. Princess Marie Luise Franziska "Amalie" of Saxe-Coburg and Gotha, full German name: "Marie Luise Franziska Amalie, Prinzessin von Sachsen-Coburg und Gotha, Herzogin zu Sachsen" (23 October 1848, Coburg, Saxe-Coburg and Gotha – 6 May 1894, Schloss Biederstein, Schwabing, Munich, Kingdom of Bavaria) was a Princess of Saxe-Coburg and Gotha by birth and a Duchess in Bavaria through her marriage to Duke Maximilian Emanuel in Bavaria.  Amalie was the fourth child and second eldest daughter of Prince August of Saxe-Coburg and Gotha and his wife Princess Clémentine of Orléans.  Her youngest brother was Ferdinand I of Bulgaria. Princess Victoria Melita of Saxe-Coburg and Gotha and Edinburgh , later Grand Duchess Victoria Feodorovna of Russia (25 November 1876 – 2 March 1936) was the third child and second 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 and Emperor Alexander II of Russia. Grand Duchess Kira Kirillovna of Russia (9 May 1909 – 8 September 1967) was the second daughter of Grand Duke Kirill Vladimirovich of Russia and Princess Victoria Melita of Saxe-Coburg and Gotha.  She married Prince Louis Ferdinand of Prussia. Princess Marie-Cécile of Prussia (Marie-Cécile Kira Viktoria Luise; born 28 May 1942 in Cadinen, Kreis Elbing) is the daughter of Louis Ferdinand, Prince of Prussia, and his wife, Grand Duchess Kira Kirillovna of Russia.  Her paternal grandparents were William, German Crown Prince, and Duchess Cecilie of Mecklenburg-Schwerin; maternally, she is a granddaughter of Cyril Vladimirovich, Grand Duke of Russia, and Princess Victoria Melita of Saxe-Coburg and Gotha. Prince Louis Ferdinand Oskar Christian of Prussia (German: "Louis Ferdinand Oskar Christian Prinz von Preußen"; 25 August 1944 – 11 July 1977), also called Louis Ferdinand II or Louis Ferdinand Jr., nicknamed "Lulu", was a member of the House of Hohenzollern and the fifth of seven children of Prince Louis Ferdinand of Prussia and his wife, Grand Duchess Kira of Russia. Prince Christian-Sigismund of Prussia (born March 14, 1946) is one of the three paternal uncles of Georg Friedrich, Prince of Prussia, head of the House of Hohenzollern since 1994, which reigned over Germany until 1918.  He is the youngest of four sons born to Louis Ferdinand, Prince of Prussia (1907-1994) and Grand Duchess Kira Kirillovna of Russia (1909-1967).  He was the heir presumptive to the headship of the deposed House of Hohenzollern from the death of his father to 20 January 2013, when Georg Friedrich fathered twin sons, relegating Christian-Sigismund to a more remote place in the Line of succession to the former German throne.
Answer: Princess Victoria Melita of Saxe-Coburg and Gotha