I agree with your characterization of her but I think last night she was doing that on purpose. I think she was trying to play off on the "keep me because I'm such a bad person" plan. I think if there was any doubt in anyone's mind, she sealed her fate with that display.
My prefered finish order would be Malcolm, Denise, Skupin and then Lisa. Lisa I find annoying all the time and to be a hypocrite as well. Don't say you want to play the game one way and then play just the opposite and try to justify what you are doing.