Well, keep in mind that Palin really exploded onto the Election, the speechwriters could not have a series of speeches prepared for her, and it “may” be that the one speech is all they had prepared for her to give.
Sarah is disengaging from the campaign for a short time to see her son Track off to Iraq along with the AK National Guard, and ABC is tagging along, after that, we’ll see what they prepared for her over those couple of days.
I’m not too worried personally about whether she can speak. She did 14 minutes of her convention speech without a teleprompter from what I can tell so a typical stump speech ought to be well within her range of talents.