The Pureblood Daughter

When the dark lord wants to attempt making a horcrux out of a living person, Bellatrix Lestrange naturally offers her and her husbands newborn daughter. After the first fall of Voldemort and the arrest of her parents, this girl, Nesta Lestrange, is raised by her aunt Andromeda and tries to forget her past. This however gets tricky, when she attends Hogwart and finds Malfoy trying to make an ally of her, a growing rivalry with Ginevra Weasley, a strange friendship with the peculiar Lovegood girl and a diary that allows her to communicate with one Tom Marcelo Riddle.