there are many mono-like viral illnesses with similar symptoms and not all mono blood tests are very accurate. the best is an ebv panel so hopefully this is the test she had. the less-expensive (and less-accurate) mono spot test is not as sensitive. as much as i would like to help you it would not be possible to diagnose your daughter blindly over the internet so you will need to see her medical provider again for further testing if she is not improving. there are too many possibilities to just guess. you better consult with the your doctor. these symptoms can be due to post infection recovery stage and some due to medications ill effect.
blood test for mononucleosis came back as negative but symptoms suggest otherwise. my 13 year old daughter has had blood tests for mononucleosis which came back as negative. however she is becoming more and more exhausted is pale achy has a sore throat and is sleeping a lot. what else could this be?