The Lupin girl

Sirius and Remus have a daughter. She has been going to school in America she visits them and others in the summer. When Remus gets a job at Hogwarts they decide it's safe for her to come home and be with them. She gets close to Harry and spends time with her mate . Dumbledore tries to use her but she is smarter and darker than he thinks. Her mate is also very dark.