The longer they keep resuscitating her, the more they have to lie, and the harder it gets to pull the trigger when they reach the point where they have no choice but to remove her from the race.
My motto for the donkeys when she clinched the nomination: Stuck with Hilary!
They're not stuck with anything.
I bet they've already prepared the legal paperwork and judicial arguments for replacing her.
There is probably fighting going on behind he scenes over who will get the job, and what the payoff will be if he/she isn't successful.