What if she’d really gone back six years? It would explain how the Hog’s Head was functioning as a business, would explain why Aberforth looked younger. If it was after the Battle of the Department of Mysteries, it meant that the public was aware of Voldemort’s return. If it was before she, Harry, and Ron had gone on the run, it meant that they were still alive. Ginny was still alive. Draco was still alive.