M.S.
How old is she? Are you documenting every fever..ie how high how often and for how long? Maybe your pedi doesnt quite have all the info he needs to be concerned. If not then I would consider taking her to a specialist the best thing is to take her to your family doctor for a second opion then have him or her recomend someone.
I believe that sometime pedi see soo many children with the same symptoms day in and day out that they think it probably nothing just like everyone else. BUT I dont believe that get her look at and get the facts. Good luck!
M-