Our Dr did a blood test on our 15 year old and it came back that she had mono. I had taken her to the Dr because of severe hair loss. She said the loss was from the mono and it could last up to 6 months. Have you heard of this before?
Illness is a cause of hair loss. Telogen effluvium (see eMedicine article) is what occurs in some people, though it is more common in women than men, and can occur after a bout with mononucleosis. It should pass with time, but this is something she should discuss with her doctor.