As far as I know, she only appeared ONCE with him, during his campaign, and endorsed him at that time. Doing anything else would have been ungracious. Even J. D. Hayworth, at the time, said he understood completely why she did it, and didn't hold it against her.
And to this day, J.D. fiercely defends her against lib attacks in the media. I heard him not too long ago on WMAL DC Talk Radio putting a couple of snarky libs in their place after they took shots at Sarah.
And in that one appearance, she campaigned for McCain but never said one word against J.D. She threaded that needle perfectly.