Those are good reasons (from her perspective) plus have to believe she got at least $7 figures if not 8 in the advance. Add to that the way she comes across as intensely bitter & not able to let a slight pass, and it's little wonder that she's been trying to take President Trump's spotlight and the book tour just seemed par for the course.
Of course, a fear that someone who comes across as vindictive as her opponent (and she, btw) might not settle for simply having bested her at the ballot box but might also come after her slush fund (CF) or her directly could also be a part of it, like you suggest.