Very, very glad you are taking her to a vet. You will probably have to Ace her first, I know I would! As someone else said, mouth problems can cause enormous changes in behavior. Several cats that were considered feral at the shelter where I work were found to have severe dental disease. Once that was resolved, they became lap cats. We will all be hoping that there is an underlying medical cause that has made her behavior so extreme. I don't think she'll ever be a lap cat, though.