If, after having Meg checked out to be sure she's free of physical problems that could be causing the inappropriate behavior, she still continues in this way, talk to your vet about a medication called Clomicalm. It's usually prescribed for dogs but can be safely administered to cats. I've had 4 of mine on it for several years now w/no side effects whatsoever. It's a mild antidepressant that has taken care of aggressive behavior and inappropriate urination and defecation. It usually comes in 20 mg. pills which are cut into quarters, so that each cat gets 5 mg. at night before bed. It's said to take a while to work but, fortunately, it started working immediately for me. It saved my household and my sanity. See what your vet has to say about it.