You do realize that it's probably ghost-written like all of the other books written by politicians, right?
That's a non-sequitur reply. I repeat. Read the book if you're interested in finding out the real story of her accomplishments.
In fact, once you've read Sarah's book, one of the things you'll realize is that she wrote it herself. The cadence and rhythm of her unique way of speaking is evident throughout. She's got a journalism degree, in case you didn't know, and is totally capable of putting a book together by herself.
You do realize how stupid this question is, right?