Calderwood

 was the mother of Flora and travelled through Australia. She encountered Douglas Jardine and chaperoned him when with Flora. She didn't understand cricket as a game. (AUDIO: Aimed at the Body)

The Doctor would eventually discover that Calderwood, along with many other people throughout history who looked like her, were caused by a group of Time War Daleks who — while on a mission to prevent the rise of Time Lord society on Gallifrey — created a time distortion which created alternate versions of themselves as four un-mutated Kaled people. This time distortion also caused multiple copies of these four Kaleds to appear at various points throughout time and space. (AUDIO: Effect and Cause)