C.K.
I am a nurse and was wondering more about the doctors assessment. It could be that she went though a growth spirt and the bladder has not caught up yet, but that does seem like a very high shift. Did the doctor test her urine at all? If so, then the problem is anatomical. If he did not test the urine, I think you need to start with that. There could be several reasons for the frequent urination with a bladder infection being one explanation. Go back to a urologist if you do not get any resolution from your doctor. Best of luck!