HI based on your complaints, your kid had an urinary tract infection, which needs to be evaluated further as she also had an underlying bladder diverticulum. Bladder diverticulum is responsible for causing obstruction resulting in Urinary retention and blood in urine causing infection, as is the case with your child.Please get a urine culture done to find out the bacteria causing infection. Once it is effectively treated needs surgery- Diverticulectomy for relieving the obstruction.Hope it answers your query