I had a feeling it was her and then thought, "where would she get a cloak?" Then it made perfect sense. Why would Ponyville School let her ring the bell nonstop for a week? With Rarity restoring the tapestries, the Mane 6 might eventually restore the castle. Twilight could expand the library and open it to all residents of Equestria. They're going to have a very hard time prying her out of that new library now!