Hi, How old is your daughter? What is the duration of fever?Which part of the back is aching,upper or lower? From the symptoms,its not very clear what she is suffering from as it can be due to many causes like Meningitis, Malaria, Urinary tract infection, Typhoid fever, Respiratory tract infection. I suggest you to get some tests done: Complete blood count, Peripheral blood smear for Pv and Pf antigen, Widal test, Urine routine analysis and culture. X-ray of the back and ultrasonography of the abdomen ll also be needed. Meanwhile,you can give her anti-pyretics like paracetamol for fever and backache, ondensatron for vomiting, and a broad spectrum anti-biotic like cefixime and azithromycin for preventing infection. Kindly review your physician with all these reports. Take care