I am an adult nephrologist and I have no expertise in the treatment of childhood urological illnesses. The problem that you describe is a urological disease and must be evaluated and treated by a urologist. I recommend that you consult with a pediatric urologist about your daughter’s illness. It also may be very important to culture your daughter’s urine to make sure the exact bacteria causing the infection is known and also to test the bacteria for sensitivity to antibiotics so that the appropriate antibiotic can be administered.
For more information about childhood hydronephrosis, please visit our website at: https://www.kidney.org/atoz/content/hydronephrosis-child