What else can be done about my mother's UTI?

My mother's UTI doesn't go away. More than a month taking different antibiotics. 92 with Alzheimers. What else can be done? She had two blood transfusion due to she has an internal bleeding, but they don't know from where. She had an endoscopy but wasn't from there. Because of her age and the Alzheimers some test are very risky. Now her doctor wants for her to see an urology. Are any of your loveones had this situation? Please let me know. Thank You