Part of the problem is that she urinates very frequently, sometimes 20 times per day. Frequent sqatting, sometimes only a few drops, sometimes a more normal urination.

She has had at least three urinalysis tests done, all confirming the UTI and showing no improvement. We had a sterile urine sample taken directly from the Bladder which did not grow a culture, indicating that there was no infection in the Bladder. Thus the UTI is downstream of the Bladder.
A blood test, indicated that there was no damage to the Liver or Kidneys, at least at that time.

She is being fed Eukanuba. At one point we switched to Inova then California Natural since we understand that Eukanuba contains Yeast. They didn't help but caused her to have loose stools.

Thanks again for your replies.