Ursa Minor

A 19-year old Hermione, newly an Animagus, falls back in time 20 years. Deciding the safest place for a young witch misplaced in time to hunker down until she can return would be Hogwarts, Hermione joins the 7th year Gryffindors of the time, and makes friends with people she'd previously only seen in photographs. Rated T for now, but this may change later.