Wow. That's a brainbuster, all right. Usually I think of "pain peeing" from crystals as a totally different situation from "stress peeing," and I've never heard of a cat having both kinds of crystals at once. That's truly weird - it makes me wonder whether there might have been two different cats' pee in the sample.
At least it sounds like the valium helped her, so maybe she's able to pee but holding it out of nervousness? Do the other cats attack or watch her in the litterbox?
Anyway, another thing that helps with stress is Feliway, a sort of "kitty incense" that mimics their "this is a safe place" facial scent hormone. And since there are indeed crystals involved, it might be worth asking the vet whether Cosequin (a supplement to strengthen the lining of the bladder/urethra) might help.
Please keep us posted!
Love, Columbine
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