“She did the DNC convention just fine.”
Her reaction to a few balloons falling from the ceiling was way over the top. She is not well in the head.
Could be but she still received a sizeable bounce out of the DNC convention and is still ahead of Trump in the polls. She went through a full day of grilling at public hearings and didn't collapse. She is probably under the best medications money can buy. So while it could happen I would not bank on a Hillary collapse coming to Trump's rescue.