my daughter is 14 years old, she has mono, for a year now. unforantly, she is losing weight again,she lost 13pds. in 4 months.she was 113pds, now shes 98 pds. is this apart of mono symptoms? she is very skinny, not healthy at all.two years ago she lost15 pds in 6weeks, but that was due to her father dyshe is also ing. it took over a year to start gaining weight, now shes losing weight again. what does she have?