For some reason, that I cannot figure out, my two sisters are fighting. The one that is starting it, is being aggressive to the dogs and humans in the house as well. All of the sudden. Nothing happened. We live in the middle of 40 acres and there are no strays around to taunt her thru the windows. Shes an inside cat, that usually goes outside to sit on her perch, on the porch, for like an hour each day. Their food is separate. I've tried the vanilla extract thing and its not working. She's acting like a totally different cat. On high alert, when she is normally very docile. Doesn't want to come out of my daughters room, which is where she spends most of her time anyhow. But even to eat/drink. Any other suggestions?