So, place Herself, Madame Benghazi, the Cold & Joyless, in a position that the question put forth CANNOT be dodged. Herself may have residual effects of the stroke suffered in December 2012, that have seriously impacted her cognitive capabilities, much like the gunshot wound to the head that eventually caused Arizona Congress member Gabrielle Dee Giffords to give up her seat. When this becomes apparent to enough people (and the DNC is having serious second thoughts about the future of the 2016 Presidential contest), the best resolution may for Herself to step down while still able to move under her own power.
But narcissism and ego are still pretty powerful forces in some people.