Carole
My son had an obstructed ureter and so his kidney was enlarged. He developed a lot of bladder infections from various tests and also "just because." You should make sure you take her to a specialist for children. We didn't at first. They did surgery to take out the obsruction. It was horrible. My son was having bladder spasms and was in constant pain. The doctor was so flippant "you're just a concerned mother" We switched specialists and we are so thankful we did. He had to do surgery again to fix what the other doctor did, but my son has permanent kidney damage now. He is otherwise normal and healthy, and has no ill effects from the surgeries, but if I could have spared him that pain, I would have. Good luck to your niece