Dorea Narcissa Lestrange

Voldemort failed to kill all the Potters that night. Dorea Rose Potter was taken and raised by Bellatrix, Rodolphus, and Rabastian Lestrange as well as Regulus Black, staying very close with her cousin, Draco Malfoy. What happens when the Potters finally find their daughter and the famous 'Potter Luck' kicks in during the time she spends at Hogwarts during the Triwizard Tournament?