Brazile is a political operative. She is acting on orders from people much more powerful than her who have decided its time to get rid of the Clintons.
Or she has "Gone Rouge" and has a dead-man-switch Dossier that keeps here alive, just like Assange and she has either told them or shown them the whole thing or pieces of it.
You don't do this the brass ones she is exhibiting unless you hold a Trump Card, no pun intended. As someone said here and elsewhere, she knows where the bodies are buried, maybe she's telling team Clinton and Obama, hey guess what, don't even think about it, I got it covered, she is not a dummy IMHO...