Sounds like your daughter may have Interstitial Cystitis. It is an inflammation of the bladder. No one knows what causes it for sure but those with Fibromyalgia tend to have it. I have had it most of my life and was diagnosed with IC, finally in my 30's. Ask a urologist or neurologist about it. A scope of the bladder will reveal cracks and crevices in the bladder. It is quite a painful condition. But can be rememdied with applications of silver nitrate into the urethra, the tube where the urine drains from the bladder. Sometimes there is restriction in the urethra that causes pain also. And sometimes an infection is not even present, just the pain. I am an expert in this field as have been to many urologists. Am also a nurse. But the silver nitrate worked for me.