It would be absolutely stupid if they didn’t ask her to speak. It isn’t like she lost the nomination the way that Reagan did in ‘76. In ‘76 it was obvious that Reagan should have been nominated. In 2012 the GOP won’t have her as a choice. She can really fire up the base for the candidate and give everyone hope for a 16 year run at the White House. It is what she does best.
She can no longer “fire up” as many as you suppose.