Question: Who is the maternal grandmother of Archduchess Elisabeth Of Austria (1922–1993)?

Knowledge 1: Archduchess Elisabeth of Austria (1922–1993)
Archduchess Elisabeth of Austria (31 May 1922 – 6 January 1993) was a member of the House of Habsburg-Lorraine.She was the youngest daughter of Charles I, the last Emperor of Austria, and his wife, Princess Zita of Bourbon-Parma. [SEP] Knowledge 2: Zita of Bourbon-Parma
Zita of Bourbon-Parma ("Zita Maria delle Grazie Adelgonda Micaela Raffaela Gabriella Giuseppina Antonia Luisa Agnese"; 9 May 1892 – 14 March 1989) was the wife of Charles, the last monarch of Austria-Hungary.As such, she was the last Empress of Austria and Queen of Hungary, in addition to other titles.Born as the seventeenth child of the dispossessed Robert I, Duke of Parma, and his second wife, Infanta Maria Antonia of Portugal, Zita married the then Archduke Charles of Austria in 1911.Charles became heir presumptive to the Emperor Franz JosephI of Austria in 1914 after the assassination of his uncle Archduke Franz Ferdinand of Austria, and acceded to the throne in 1916 after the old emperor's death.After the end of World War I in 1918, the Habsburgs were deposed and the empire became four independent countries, Austria, Hungary, and the newly formed Czechoslovakia and State of Slovenes, Croats and Serbs.Charles and Zita left for exile in Switzerland and were subsequently removed from Hungary by the Allies to Madeira, where Charles died in 1922.After her husband's death, Zita and her son Otto served as symbols of unity for the exiled dynasty.A devout Catholic, she raised a large family after being widowed at the age of 29, and never remarried.
Knowledge 1: Zita of Bourbon-Parma
Zita of Bourbon-Parma ("Zita Maria delle Grazie Adelgonda Micaela Raffaela Gabriella Giuseppina Antonia Luisa Agnese"; 9 May 1892 – 14 March 1989) was the wife of Charles, the last monarch of Austria-Hungary.As such, she was the last Empress of Austria and Queen of Hungary, in addition to other titles.Born as the seventeenth child of the dispossessed Robert I, Duke of Parma, and his second wife, Infanta Maria Antonia of Portugal, Zita married the then Archduke Charles of Austria in 1911.Charles became heir presumptive to the Emperor Franz JosephI of Austria in 1914 after the assassination of his uncle Archduke Franz Ferdinand of Austria, and acceded to the throne in 1916 after the old emperor's death.After the end of World War I in 1918, the Habsburgs were deposed and the empire became four independent countries, Austria, Hungary, and the newly formed Czechoslovakia and State of Slovenes, Croats and Serbs.Charles and Zita left for exile in Switzerland and were subsequently removed from Hungary by the Allies to Madeira, where Charles died in 1922.After her husband's death, Zita and her son Otto served as symbols of unity for the exiled dynasty.A devout Catholic, she raised a large family after being widowed at the age of 29, and never remarried. [SEP] Knowledge 2: Maria Theresa of Austria-Este (1849–1919)
Maria Theresa of Austria-Este (Maria Theresa Henriette Dorothee; 2 July 1849 – 3 February 1919) was the last Queen of Bavaria.She was the daughter and only child of Archduke Ferdinand of Austria-Este and his wife, Archduchess Elisabeth of Austria.
Knowledge 1: Archduchess Elisabeth of Austria (1922–1993)
Archduchess Elisabeth of Austria (31 May 1922 – 6 January 1993) was a member of the House of Habsburg-Lorraine.She was the youngest daughter of Charles I, the last Emperor of Austria, and his wife, Princess Zita of Bourbon-Parma. [SEP] Knowledge 2: Archduchess Elisabeth Franziska of Austria (1892–1930)
Archduchess Elisabeth Franziska Marie Karoline Ignatia Salvator (27 January 1892 – 29 January 1930) was the eldest daughter of Archduke Franz Salvator of Austria and Archduchess Marie Valerie of Austria.Through her mother, she was a granddaughter of Emperor Franz Joseph I of Austria.

Answer: Infanta Maria Antonia of Portugal