Hi again, and thanks for your patience.
If the urinalyses showed moderate bacteria, was your girl put on antibiotics for a UTI? This might help with her discomfort upon urination and then she'll move back to eliminating in the litterbox all the time.
When cats eliminate inappropriately, it can also be caused by stress or anxiety and a condition called idiopathic (cause unknown) interstitial cystitis, which causes discomfort. Diet might also be related to this condition, so make sure you are feeding a high quality canned food that contains no artificial ingredients and real meat (no by-products) is the first ingredient. Canned is better than dry, because it contains more moisture. Encourage her to drink more by getting a cat drinking fountains. Cat love to drink from a moving water source.
Get some Feliway plug in diffusers; these emit calming pheromones to help diminish stress.
You can also try Rescue Remedy for Pets or Composure treats (one at a time, not simultaneously). These are over the counter oral anti-stress treatments.
Get some 'Cat Attract' litter or litter additive to add to her current litter (which should be unscented) and make sure her litterbox(es)--you should have at least 2) are open, not covered. Cat Attract contains herbal attractants that encourage use of the litterbox.
It's also important to clean the soiled areas with an enzyme-based cleaner for organic/pet stains and odors, like Nature's Miracle, Zero Odor, Odor Mute or many more you will find at your pet supply stores. If she continues to smell where she went before, she'll be attracted to it and think it is an acceptable toileting area. After you clean these areas and they're all dry, you can lightly spray some Feliway spray on them, to make her think she 'marked' there, already. Let the spray dry completely (about 30 min.) before allowing her access to these areas.
There are also various prescription medications that can help with inappropriate urination; they are typically in the anti-anxiety/anti-depressant class. Clomicalm is well recommended, so discuss this with your vet:
If your cat is uncomfortable, also discuss some pain medication for her, to help her feel better.
I hope all will be well with your beautiful Persian girl!
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