We were fostering a mother cat and her 5 kittens and she had the same behavior. I kept one of the kittens and she picked up the behavior, but she likes to pee in the fireplace. You said you've tried everything, have you tried getting a different kind of litter? She may need to be locked in a bathroom with a few different types of litter so you can see what kind she prefers. If you have already done this, I cant tell you what to do. She may need to be an only cat, that was the problem with out foster mom cat, she didnt like her kittens either. We ended up feeding them and giving the mother back to the shelter.
Good luck.
-Beth

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