D.P.
I believe all you need to do is to have her urine tested to see if there are white blood cells which indicate a UTI. They will quickly analyze it right there. Call your ped and ask if you can bring a urine sample from home or what they recommend you do. The sooner the better. As I was told, you can have a million UTIs but O. infection that gets to the kidney can be very bad. The sooner you get it taken care of, the better. If it turns out to be nothing--better safe than sorry. Good luck!