Do you mean that you went to school this morning and the tail looked different when you came home this afternoon, or that when you got back from college the tail looked different? I ask because if it's been awhile since you've seen your leo and the tail looks deflated it may be that she's lost weight and the tail is not as fat as it was. It may be because she's ovulating or because she's ill. Check first to see if she's eating and pooping.