Harry potter return to the wizerding world!!

Raven Collins. Raven is a mysterious girl. When Harry Potter goes to Hogwarts and sees her he knows she's a mystery. But he sees she's hiding something on her forehead with her bangs. So when he faces quirll/Voldemort, and she comes and saves him, and shows her scar, he knows that like him she serviced the death curse. But who was she?

Read to find out!