Has she had a blood test for Mono? My daughter had it a while ago and she actually was so ill that she ended up being hospitalized. If your daughter hasn't been tested I would recommend testing her, and if she has and the results were negative, you might want to test her again. I have heard about cases where one day it was negative and a few days later it was positive. My daughter lost a lot of weight and her glands were so swollen that she couldn't swallow even a teaspoon of water, and her oxygen levels were very low.