Just Takes Time

After the war, Hermione finds herself stuck. Her two best friends are shells of who they used to be, and every day feels like an echo of the last. She has no idea what to do- until she remembers the Time-Turner she gave back in third year.
Unfortunately, any Time-Turner going further than a day goes a little wonky, and Hermione goes a little further back than she wanted to. Actually, she goes back to before she and her best friends were even born.
Hermione Jean Granger is stuck in Hogwarts in 1974. During the First Wizarding War.
During the Marauder's fourth year.