My 9 year old daughter has been feeling sick since Thursday the 10th..I took her to an urgent care yesterday, and they did a strep test, flu test and blood work to check her appendix...all came negative. They recommended I go to the E.R. I took her, and they then did a chest xray, which was clear, and a urine specimen, which didnt show anything. She still has a fever running around 100- 101.8, small appetite and very tired. She does have a cough and some congestion(sniffles). I am worried, can you give me some advice??
She might be suffering from viral fevers which cannot be detected by routine investigation. Better to start antibiotics and anti pyre tics for continuous 3 days with proper HY Chat Doctor.  If still fever persist, then do a blood culture. You will find the cause for fever.