She Knew

What if there was a bit of additional information that Dumbledore shared about the prophecy with Alice and Lily that affected the night Harry survived the Killing Curse? What if Dumbledore had a theory about The-Boy-Who-Lived? Marauders era. Pre-Harry (sort of, he's in Lily's stomach). Not really AU, but more a theory that JKR has never explained. One-shot. Rated T just in case.