MY 15 YEAR OLD DAUGHTER WAS DETERMINED TO HAVE A

MY 15 YEAR OLD DAUGHTER WAS DETERMINED TO HAVE A UTI THREE DAYS AGO. SHE WAS PUT ON 500 MG CEPHALEXIN. SHE WAS GIVEN A SHOT IN THE DOCTORS OFFICE OF CEFTRIAXONE. SHE HAS HAD CONTINUED LOWER BACK ACHES, CONTINUED FEVER AND BODY RASH. IS THIS NORMAL? FEVER IS 103. WE REVISITED THE DOCTORS OFFICE YESTERDAY AT 5:30 AND THE NURSE SAID THIS IS NORMAL. MY DAUGHTER FEELS WORSE AND WANTS TO GO TO THE ER.