A.S.
Get her checked for a bladder infection! My kids have battled (both girls) with bladder infections on and off. My youngest had one that was so severe, even though I caught it early enough and had medication (it was the wrong kind for her and didn't work) it put her in the hospital with kidney infection. I'm not saying your daughter is that sick, but the pediatrician told me that the particular strain my daughter had, which had started internally not from a yucky diaper or anything didn't cause any pain until it was too late. I had chalked up the fevers for the first few days to teething, but when I couldn't get them to go away I took her in.
It never hurts to get them checked, fevers are a sign that there is something not right inside her body. She's too old for teething so I'd get her checked. The other thing is check her gums, if she has a hidden gum problem that might be it too. Remember some kids have crazy pain tolerence and won't say when things hurt.
Whatever you do, trust your gut, you're worried, then it's your job to soothe those worries with investigation!
Good luck and let us know what happens!