Kaymee Arnod was a Warden in theGraxis System. (AUDIO:The Exterminators)

She fought with the other Wardens against theDaleks' plan togeo-form their system. (AUDIO:The Demons)

She caught theNFS plague, but received theVariant 7 cure from the Daleks. However, this was part of their greater plan. Variant 7 contained genetic material that, when exposed to a certain kind of radiation, would transform the recipient of the "cure" into a Dalek, which is what happened to Kaymee. (AUDIO:The Warriors)