At the age of three, Liv Cole watched as her father and mother argued before the accident. She heard the thump as her mother, Jasmine, fell. Her grandmother, Donna, found Jasmine's twisted body the next morning. Fearing for Liv's safety, Donna fled the state with Liv and changed their identities.
Twelve years later, Liv's father, Ty, reappears in her life. Ty confronts Donna and she finally confesses the details only she knows about Jasmine's death.
I'm GLAD she's dead, glad I say! In fact, let's kill her again! And again!
You're missing all the elements I'd need to see in a hook.