LOL!! Go weigh it
Whether that happened in Aedryans care or the former owner, but that tail probably got squshed at some point. It wouldn't take much force to damage that fragile bone. If the edge of the bowl sat down on that tip, her trying to pull it away might have been enough to cause that damage. Since the tail was in between the hard bottom of the cage (no substrate, just paper) and the thin edge of the full bowl.