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Yes, when she absorbed the Time Vortex, she became the Bad Wolf, giving her the ability to destroy the Daleks. The power would soon have killed her, however, so the Doctor absorbed it into himself, which caused his regeneration at the end of "The Parting of the Ways". It's unclear how much memory she retained of this, but "Doomsday" suggests she has some recollection as she recalls destroying the Dalek Emperor as Bad Wolf.