Kaymee Arnod

 was a Warden in the Graxis System. (AUDIO: The Exterminators)

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

She caught the NFS plague, but received the Variant 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)