Darla von Karlsen

Darla von Karlsen was a near-human woman whom the Doctor met on Skaro after recieving her plea for help. She told the Doctor that her daughter Hannah was trapped in a Dalek prison camp and that Darla had escaped from the camp. The Doctor was suspicious, and rightly so; the Parliament of the Daleks had actually turned her into a Dalek puppet and given her the mission of securing the Eleventh Doctor for their plan to destroy the Dalek Asylum. (TV: Asylum of the Daleks)

She also had a short conversation with The Doctor, him questioning the outcome of her dalek-puppet conversion. When said by The Doctor, 'You had a daughter.' she replies saying 'I know, I broke my vow.' which in condition means that her vow was to save her daughter from the dalek prison camp. There is no evidence that her daughter had survived or was converted in the camp.