Question: What did Anna Katharina von Offen serve as for Sophia of Hanover?

Context paragraphs:
Anna Katharina Schwabroh: Anna Katharina Schwabroh (October 21, 1979 in Hamburg) is a German actress.

Anna Katharina Schönkopf: Anna Katharina Schönkopf (] ; also called „Käthchen“ (]) and „Annette“ (]); * 22 August 1746 Leipzig - 20 May 1810 ibidem) was the daughter of the pewterer and wine merchant Christian Gottlieb Schönkopf (]; 1716-1791) and his wife Katharina Sibylla (]), born Hauck (]; 1714-1790).  The young Johann Wolfgang Goethe, who studied in Leipzig from 1765 to 1768, fell in love with her in 1766.

Anna Katharina Schmid: Anna Katharina Schmid (born December 12, 1989) is a Swiss pole vaulter.  She won the bronze medal at the 2007 European Junior Championships.

Anna Katharina Block: Anna Katharina Block (1642, Nuremberg – 1719, Regensburg), was a German Baroque flower painter.

Anna Wienhard: Anna Katharina Wienhard (born 1977) is a German mathematician whose research concerns differential geometry, and especially the use of higher Teichmüller spaces to study the deformation theory of symmetric geometric structures.  She is a professor at Heidelberg University.

Sophia of Hanover: Sophia of the Palatinate (commonly referred to as Sophia of Hanover; 14 October 1630 – 8 June 1714) was the Electress of Hanover from 1692 to 1698.  As a granddaughter of James VI and I, she became heir presumptive to the crowns of the Kingdom of England and the Kingdom of Ireland under the Act of Settlement 1701.  After the Acts of Union 1707, she became heir presumptive to the unified throne of the Kingdom of Great Britain.  She died less than two months before she would have become queen, and her claim to the throne passed on to her eldest son, George Louis, Elector of Hanover, who ascended as George I on 1 August 1714 (Old Style).

Anna Katharina Kränzlein: Anna Katharina Kränzlein, also known as Anna Katharina, (born 7 November 1980 in Fürstenfeldbruck, Germany) is a German violinist.  She is most known for her quick and varied technique.  She is the youngest founding member of Medieval folk rock/folk metal band Schandmaul.

Katharina von Zimmern: Katharina von Zimmern (* 1478 in Messkirch; † 17 August 1547 in Zürich), also known as the imperial abbess of Zürich and Katharina von Reischach, was the last abbess of the Fraumünster Abbey in Zürich.

Anna Katharina von Offen: Anna Katharina von Offen (1624-1702), was a German courtier and royal governess.  She served as Oberhofmeisterin to Sophia of Hanover, and also served as governess to her children.

European Medical Students' Orchestra and Choir: European medical students' orchestra and choir began in 2009 when European medical students' orchestra (EMSO) and European medical students' choir (EMSC) joined forces to produce a spectacular series of concerts in Ljubljana and Piran, Slovenia under the direction of two highly skilled and dedicated conductors - Martina Batič and Marjan Grdadolnik.  The union of the orchestra and the choir was so successful that the cooperation of EMSO and EMSC continued with concerts in Chester Cathedral and the Royal Northern College of Music, Manchester in 2010 under the conduction of John Anderson and Daniel Parkinson, and in Giessen and Frankfurt, Germany in 2011, under the leadership of Stefan Ottersbach and Anna Katharina Kalmbach with once again spectacular concerts that astonished the local audience and media.

Supporting paragraphs: Anna Katharina von Offen Sophia of Hanover
Answer: Oberhofmeisterin