First, no, I've never dealt with exactly that kind of behavior before coming out of nowhere. It sounds like you are doing everything right though by separating them and having her thoroughly checked out by the vet. When she comes home I would definitely continue to keep them separate for quite some time.

Is the vet she is with now the same one that spayed her? It is possible that some vets go too quickly and leave some ovarian tissue behind, causing the cat to still get those horomones flowing and to have periods of their heat cycles. We all know cats in heat can sometimes act crazy and she is at an age where she could be in a sort of heat cycle.

Once the vet has ruled out any physical cause for this behavior, definitely contact a certified behaviorist to see what can be done to re-introduce your kitties.

And, when you do find out something please let us know. I'm very curious to see what's going on with her.

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