I agree. She should either endorse one now or atleast announce that she's not running (if that's the case).
At this point, keeping us questioning's going to hurt the other candidates and especially the one that will end up as the nominee.
“She should either endorse one now or at least announce that she’s not running (if that’s the case).”
Yes, that would be better. Withhold the endorsement until they perform up to her standard - assuming she does not run.