Title: Duchess Anna of Prussia
Content:  Duchess Anna of Prussia and Jülich-Cleves-Berg (3 July 1576 – 30 August 1625) was Electress consort of Brandenburg and Duchess consort of Prussia by marriage to John Sigismund, Elector of Brandenburg. She was the daughter of Albert Frederick, Duke of Prussia, and Marie Eleonore of Cleves.
Title: Duchess Anna of Prussia
Content: George William (13 November 1595 – 1 December 1640); successor of John Sigismund. ; Anne Sophia of Brandenburg (15 March 1598 – 19 December 1659); married Frederick Ulrich, Duke of Brunswick-Lüneburg. ; Maria Eleonora of Brandenburg (11 November 1599 – 28 March 1655); married Gustavus Adolphus of Sweden. They were parents of Christina of Sweden. ; Catherine of Brandenburg (28 May 1602 – 27 August 1644); married first Gabriel Bethlen, Prince of Transylvania and secondly Franz Karl of Saxe-Lauenburg. ; Joachim Sigismund of Brandenburg (25 July 1603 – 22 February 1625). ; Agnes of Brandenburg (31 August 1606 – 12 March 1607). ; John Frederick of Brandenburg (18 August 1607 – 1 March 1608). ; Albrecht Christian of Brandenburg (7–14 March 1609). 
Title: Anna of Pomerania, Duchess of Lubin
Content:  Anna of Pomerania ( Anna Pomorska) (1492 – 25 April 1550) was a German Princess. She was a member of the House of Pomerania (also known as House of Greifen or House of Griffins) and by marriage Duchess of Brzeg. She was the eldest daughter of Bogislaw X, Duke of Pomerania, by his second wife Anna, daughter of King Casimir IV of Poland.
Title: Duchess Anna of Prussia
Content:  Anna was married to John Sigismund on 30 October 1594. Anna was described as intellectually superior to her spouse, temperamental and strong-willed. She is reported to have thrown plates and glasses at her spouse during arguments. She fought on her own to secure her succession rights to various fiefs and handled negotiations with her competitors. In 1612, she placed her demands before the Emperor. After the conversion of her spouse to Calvinism, Anna became the protector and spokesperson of the Lutherans. She continued to play an important role during the reign of her son. She opposed the Habsburgs and secured the marriage of her daughter Maria Eleonora to King Gustavus Adolphus of Sweden against her son's will in 1620.
Title: Anna of Württemberg
Content:  Anna of Württemberg (Anna Wirtemberska; 12 June 1561 in Stuttgart &ndash; 7 July 1616 in Chojnów), was a German princess, member of the House of Württemberg, and by her two marriages Duchess of Oława-Wołów and Legnica. She was the daughter of Christoph, Duke of Württemberg, by his wife Anna Maria of Brandenburg-Ansbach, daughter of George, Margrave of Brandenburg-Ansbach.
Title: Princess Anna of Prussia
Content:  Princess Maria Anna Friederike (17 May 1836 – 12 June 1918) was a Princess of Prussia. She was usually called Anna.
Title: Anna of Saxony (1567–1613)
Content:  Anna of Saxony (16 November 1567 - 27 January 1613), was a German noblewoman member of the House of Wettin (Albertine branch) and by marriage Duchess of Saxe-Coburg-Eisenach. Born in Dresden, she was the twelfth of fifteen children born from the first marriage of Augustus, Elector of Saxony and Anna, Princess of Denmark. From her fourteen older and younger siblings, only three survived to adulthood: Elisabeth (by marriage Countess Palatine of Simmern), Christian I, Elector of Saxony and Dorothea (by marriage Duchess of Brunswick-Wolfenbüttel).
Title: Anna Sophia of Prussia
Content:  Anna Sophia of Prussia (11 June 1527 &ndash; 6 February 1591) was Duchess of Mecklenburg by marriage to John Albert I, Duke of Mecklenburg.
Title: Grand Duchess Anna Petrovna of Russia
Content: Prince Peter Feodorovich, Hereditary Duke of Holstein-Gottorp (21 February 1728 &ndash; 17 July 1762). In 1739, Peter's father died, and he became The Duke of Holstein-Gottorp as Karl Peter Ulrich. He could thus be considered the heir to both thrones (Russia and Sweden). After the death of his aunt, Elizabeth of Russia, he ruled over the Russian Empire as Peter III, Emperor and Autocrat of All the Russias and was the husband of Catherine the Great of Russia. Through him, Anna became ancestress to all subsequent rulers of Russia except Empress Catherine II (her daughter-in-law). Through her marriage with the Duke Karl Friedrich, she had one son
Title: Grand Duchess Anna Petrovna of Russia
Content:  Grand Duchess Anna Petrovna of Russia, Tsesarevna of Russia А́нна Петро́вна; 27 January 1708, in Moscow &ndash; 4 March 1728, in Kiel) was the elder daughter of Emperor Peter I of Russia and his wife Empress Catherine I. Her younger sister, Empress Elizabeth, ruled between 1741 and 1762. While a potential heir in the reign of her nephew, she never acceded to the throne due to political reasons. However, her son Peter would rule as Emperor in 1762, succeeding Elizabeth. She was the Duchess Consort of Holstein-Gottorp by marriage.

Question: Who is the mother of Duchess Anna of Prussia?
Answer: Marie Eleonore of Cleves.