Shattered Future, Fixed Past

War decimated the Wizarding World, until Lily Potter created a Horcrux, to send her fifty years into the past, to try to advert disaster. She had expected to die after destroying Voldemort, but she lived. She wakes up in hospital, her memories modified and tries to pick up the pieces of her life. Then there is Snape who clearly wants her to be someone she doesn't think she can be.