Hardly. I like her.
When Obama came into office, she was one of the few to stand up and throw a wrench into the works to try and stop him as he bulldozed his way across a rather supine congress.
From my memory, the people on the front lines at the very beginning were Bachmann in congress, DeMint in the senate, Palin from outside. Gingrich started making the rounds, too, making speeches where ever he could find someone to listen to him.
Romney? Romney was very quiet during those early fights. In fact, Romney couldn't be roused to come out and fight except to go after Palin, and the tea party. And, now, Gingrich.
Whether or not you like her is absolutely irrelevant to the question of RINOism.
Really folks, we do not need to reduce the value of that term anymore by turning into "What I call people I don't like". We got plenty of words for that feeling.