I have 2 kitties that are both right at a year old. Miss Priss got sick last weekend with what we believe is vestibular disease. She is still a bit off balance but recovering nicely. My other cat, Gabby, out of nowhere has started to hiss at Miss Priss and try to attack her any time she see's her. I don't know what to do. They are both fixed, have been together for over a year since I rescued them from the humane society, and have always gotten along before the one got sick. I am currently keeping Miss Priss in our guest room alone so she can finish her recovery and keep Gabby from attacking her. Any suggestions would be greatly apperciated!