11. Because she has the goods on the right people
It's been pretty clear from the outset that this is the real reason. She won't "go quietly" and given the lack of a credible "Plan B" for the D ticket, the best option for all concerned is to "make history" nominating the first woman for president and then let her go down in flames in the general.
LOL. Reminds me of my over decade old tagline...