That is an excellent question and one that would be best answered by her doctors
">primary care doctor or someone specializing in infectious diseases of children, such as a pediatric infectious disease doctor or regular pediatrician
. This sounds very concerning, and although there is not much history about what other medical problems she has or whether she has any other symptoms other than the fever, the doctors should be performing the complete work up to find out why she is having these high fevers for this long. Potential causes for fever include if she has an infection after surgery, or she has a urinary tract infection, or GI infection, or neurological infection such as meningitis or intracranial abscess, amongst a variety of other causes. She could also be having these fevers after taking certain medications. Standard workup of patients with fevers include chest x-rays, urine tests, spinal tap procedures to make sure the spinal fluid isn't infected, abdominal x-rays, and checking that she does not have any foreign bodies such as earrings or tampons that could be causing her to have an infection that is difficult to find. It is best to be evaluated by a doctor as soon as possible for this to find the cause and treat it.