The vet weighed her and said that her weight wasn't much different from the last time she was there. He also said that she HAD been eating, and that all we need to do is give her this certain medicine (don't worry, I checked and it's NOT on the dangerous list) along with, believe it or not, Flintstones Vitamins. (Of course a smaller dosage than a human.) It turns out it's just a little cold/flu season thing, and that it can easily be cured.