Mitzi Wittenmeier's sister
From Tardis Wiki, the free Doctor Who reference
In 1873, Countess Mitzi Wittenmeier's sister lived in Linz, Austria. After Mitzi's husband Rolf was seriously injured by Gramm and their house in Vienna was attacked by the Marionettenburg puppets, Mitzi sent her daughter with the maid Hannalore to her sister. (AUDIO: The Silver Turk)