Does anyone have experience with UTI’S and dementia?

Get her tested by her doctor. If she has a UTI then antibiotics can clear it up. UTIs are a chronic problem in the elderly. I've helped minimize them for my MIL by giving her a maintenance supplement called D-Mannose, a simple sugar. This can be found on amazon.com. I use SuperiorLabs, 500mg and follow dosage suggestion on bottle. Since starting her on this she has not had a single UTI and she was having 1 a month. The facility had her drinking copious amounts of water and cranberry juice, to no avail. I'm normally not a proponent of supplements for reasons I won't get into here, but there was no downside to trying this since there is no known side effects to it. I supply her LTC with it and they dispense it to her. I'm frankly astonished at how well it works.

What's your actual question? The answer to what you have posted is going to be a resounding 'yes'...but what is it you want to know?