Sorry to hear you are having more trials and tribulations and it must be very hard on you watching Ashley and wondering just what is the real problem.

My Taranis pees in the tub and outside the box when she is getting stones in her bladder. There is no infection and the stones are tiny, like gravel, but extremely irritating. The only sign is pee'ing in other places, her appetite and activity remain normal. She'd had a few UTI's when she was 2 and 3 years old, then developed stones when she was about 4. She did have surgery a few years ago to clean out all the gravel. She's on SO as needed. As for Ashley not making a perfect landing sometimes, you may be so worried about her that you are seeing tiny details that you would miss at any other time.

If you can afford it, then a second vet is a good option. I've been surprised over and over again at the variation in opinion from different vets.