I feel your pain. I really, really do. It is so frustrating that I considered having Mollie euthanized. As i believe so strongly in a no-kill world, I know that I would feel the ramifications of that act forever. BUT, I wanted to do it.
I went to a mattress store and bought 100% moisture protectors. 100%. I bought the king sized and cut them up to put them in favorite pee spots and I would use them on my bed, pinned with baby pins, all the time. Didn't cut down on the peeing BUT it saved my sanity by not having to wash the world every day.
Then, I put two cats on Prozac. I fought it long and hard, but finally did it. Mollie was ONE of my pee'rs, but I had two others doing it in reaction to Mollie. This drastically cut down on my peeing situation, but by no means did it eliminate it. I would clean up 3 -4 times daily poop and pee in my kitchen. Thankfully, it was on linoleum, but still.
I think it is possible you have a cat with both medical AND behavioural issues. I have a cat that had the PU surgery. And, I still have a cat with frequent UTIs, possibly brought on by stress. Those are issues that need to be addressed, as in no way is it fair to 'blame' a cat for peeing outside the box in those conditions. They are cats, not humans that can reason, "yeah, it hurts when I pee, but I still pee in the toilet". Rarely, do stones seem to cause female cats problems. So, that is something you must figure out.
As to crating her, that HAS worked in retraining her. Does she EVER go in the box? That would be helpful to know. Does she dislike some cats? I swore by the plug-ins for a while....my mom uses some holistic cat treats that have something in them.
Bottom line- it is cat pee. It isn't the end of the world, even if it feels like it.
Edited, as I re-read your initial post. What about putting some of the other cats on Prozac? That actually worked for me. I never had Mollie (who is spay incontinent/leaks) on Prozac. I put my two other cats on it, and it calmed THEM down, which in turn, calmed Mollie down.
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