Technically, since her black pantsuit can stand up by itself, it would be difficult to prove the wearer's death. Because of Hillary's well-known stricture against subordinates looking her in the eyes, her demise might even go unnoticed. As long as she was propped up by the pantsuit, her staff would politely ignore the familiar, yet strangely stronger stench, not realizing actual decomposition had occurred until she dropped a limb or something like that.
Besides, everyone knows the deal she made with Satan includes some clause about immortality...Bill better come up with another plan.