Enchanted

Hermione Granger and Severus Snape are married. When Severus is dying by the hands of Voldemort's snake, Nagini, he sends Hermione back in time to stop Dumbledore from putting on the Gaunt ring and to save Dumbledore, him and others from unnecessary deaths during the war. He uses his time turner to send her back to her sixth year which was when they admitted their feelings for each other. She goes back and starts fixing the sequence of events so that she doesn't lose him. Will she succeed or will she lose a piece of herself in the process?