She would be gaining debating skills. I have noticed great debating improvements among most of the candidates with each debate. It won't look good to come in so green that the others look better than you because they've been sharpening their debating skills.
Sarah's already a better debater than anyone in the field, with the possible exception of Newt. She doesn't need to brush up on her skills to perform well against that crowd.
When is the last time Palin was in a debate?
Wow! That's a first. That really IS UNconventional. Ever hear the story of the turtle and the rabbit?