She actually had a reasonable shot at being the first female President, and not just by default if she were VP and Trump croaked.

Say this never happens, she's picked as VP, and Trump wins. If Trump's second term goes okay, inflation goes down, and Trump works his foreign policy magic to get a bunch of Ws just like his first term, there's a decent chance a Republican gets elected again, but obviously Trump is termed out.

If he endorses Noem at that point, she's probably the instant favorite for the nomination.

Unbelievable fail on her part. If you're a rising political figure with high aspirations as she has, you get a shitload of loyal people to preview your book from cover to cover, and give their honest takes on any problematic parts. Looks like she didn't do this.