I would go along with the meds idea, but I would also do a complete re-integration with her. The trigger of her attacks, may not be the victim of her attacks. Cats redirect their anxiety to a target that they think they can have success with.
I would use, in addition three tools. Feliway diffusers, Bach rescue remedy and vanilla.
I would isolate her, and start putting daily drops of vanilla (the purest vanilla you can get, I have Mexican vanilla, which is not artificial, and very strong) at the top of the base of her tail. Keep her isolated for 7 -10 days, if possible. (Use plastic carpet runners, anchored through the doorway, if she is going to dig her way out of the room.)
Then put the vanilla on one other cat (or animal she has attacked) probably the one that will not back down to easily. (attacking cats love when their victim runs)
The point of the vanilla is: that now the other cat smells like her, and she can't differentiate scents.
Put the Bach rescue remedy in the drinking water, and keep the Feliway diffuser on. Re-introduce one cat at a time to her, and see if she attacks them individually, trying to determine WHO is the trigger. If the trigger is not present, she may have no reason to attack the cat in the room.
Make the encounters brief, and intervene only if the fight gets out of hand, hissing growling and spitting are normal. Try to make the visits longer, and in other territories than the isolation room. Maybe it is a territory thing, that she is trying to protect, and not a cat that she's trying to attack.
(I had a foster who claimed a 6x6 ft square of territory in the family room, all cats were safe, if they did not enter the square)
PM me if you have any questions, and please, check with your vet to see if my advice is appropriate. I am not a preofessional. I DO do a lot of integration though.
Rehoming is also an appropriate choice, and that is entirely up to you.
Best of Luck.
p.s. I'm right here with you, with that hurricane thing, neighbor.
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