Hogwarts Wasteland: The Witch from the Borderlands

If Dumbledore hadn't defeated Grindelwald.
If a war between wizards and Muggles were to truly break out.
If the Fade Ones never met the Finger Witch, they would be reborn into the body of an 11-year-old witch girl.
My name is Hermione Granger, and I've come to reshape the magic ring of this broken world.
(Contains two hypotheses; please discuss rationally.)
Book club: 249695272