I noticed a distinct difference in her appearance tonight on Gretta's show too. She was not her spunky self at all, seemed quite down actually, or perhaps angry and bitter like you suggested. I just saw a person, a normally vibrant person, who seemed really down.
She is not taking any sh!! from backstabbing liars. She gave compliments to people that deserved them, and Newt was very excited and complimentary about her Iowa speech.