From TARDIS Index File, the free Doctor Who reference.

Kirsty McLaren was the daughter of Colin McLaren and the sister of Alexander McLaren. Her family and Jamie McCrimmon fled the Battle of Culloden together and took refuge in an abandoned cottage. She was not arrested Lt. Algernon Ffinch as she was out getting water at the time. She and Polly worked together to force Ffinch to give his help in rescuing their friends, reunite with the Doctor, and rescue Grey's prisoners. Reunited with her father, she and the other former prisoners left on the Annabelle for France. (DW: The Highlanders)