Most of her troubles were difficult to predict ahead of time, especially the email server and the leaks. Besides those she's actually a pretty good candidate for the party. The DNC pushed against Bernie the same way that the RNC pushed against Trump (and in previous election people like Ron Paul) and the difference was at the end of the day Bernie just didn't have the support. I'm not the biggest fan of the DNC but I'm not seeing how the leadership did anything this election different than any other election.