Unexpected Daughter

Nattally Potter had been locked in the basement of the Malfoys since she was five years old and Voldemort had came to Godric's Hollow on Halloween. Her only consolation was that her younger brother Harry lived, and when a new person walks into her life and rescues her from her prison, her whole life changes. At Hogwarts can she become the girl she was meant to be? And find her Dad?