I recall the 2008 election just fine, thanks.
Sarah entered the process late in the game and did only so-so as a candidate.
(McCain was way worse but that doesn’t matter now.)
Since 2008 Sarah has given a few speeches, made some facebook posts, had her tv show, and done a few mostly friendly interviews. She has not debated the others, run a campaign, appeared as a candidate all over the place, faced hostile interviewers, etc., etc.
She is not nearly as vetted as Romney, Santorum, or Gingrich. They are the ones who have been in the arena, not Sarah.