I went to bed last night thinking what a nightmare this thread was, but I wasn't expecting it to induce them.
If there's swelling in the brain, can't that account for some of the neurological symptoms? I suppose they'd rule that out.
But even with some brain damage, she can still have a very happy life.
It's a cat...put her down if she's useless and suffering then just get another one for free.
No need to spend that much money on a pet, gee.