First question: Why is she - even just nominally - Secretary of State? She should have resigned in disgrace within a week of losing an ambassador due to her incompetence. (An ambassador in a hostile country experiencing a violent revolution asked for more security and was denied. How much more incompetent does a Secretary of State need to be?)
Would that have hurt the President politically? Yes. Would it have cost him the couple hundred thousand votes in a few key states that was needed to turn the election the other way? Possibly. What does this prove? That Hillary Clinton is willing to lie and cover up incompetence for votes. And she wants to be PRESIDENT in 4 years?