I was thinking the same thing that it’s hormonal. She’s peeing normally, no sign of blood, and no indication of pain or straining so I doubt it’s a UTI or stones. I’ve been keeping notes and watching eating habits and behavior in addition to weight. She is feeling good and eating well. If I wasn’t using white bedding, I would never know there was an issue.
So I think at this point I'll wait and see and if there are changes I’ll contact the vet. Just 3 weeks ago the vet did a really thorough abdominal exam plus an ultrasound of her abdomen, bladder, and uterus - everything looked okay.