Kitty Donaldson

 was Molly O'Sullivan's employer. She volunteered, as did the rest of her household, as part of the Voluntary Aid Detachment and helped on the front line in France during the First World War. She fell ill after being infected by a gangrenous leg and Molly cared for her. When Time Winds bled into France during the First World War, she was killed by corrosive time. (AUDIO: The Great War)

Due to Kotris's plan to destroy the Time Lords was erased from time, she didn't die. (AUDIO: X and the Daleks)