Dalek Daisy

A "damaged" dalek from the Dalek Asylum who escaped it blowing up. She was admitted to solitary confinement because she somehow was programmed with kindness and to other Daleks was deemed insane and terrifying. 

The mere idea of a kind, gentle Dalek terrified the Parliament so she had to be locked away in her own genesis arc which opened as the Asylum exploded.

She doesn't know who the doctor is but she heard stories from other species about this lone wanderer and is interested in him.