Sarah made the decision not to run for President for a very similar reason to bowing out of the Alaska Gocernorship.
The lame-brained, half-witted Demonrats and their bedfellows the media would have pelted her with a barrage of stupid charges (lies) until she wouldn’t have had time to tend to her job of President. In Alaska the Demonrats were inundating her with false charges that she (the state) had to pay lawyers to refute.
They would do a similar thing again and it would mount up to a large mass of needless distractions. She’s smarter than they are and she saw that coming.
In other words, she couldn’t handle the heat.