IMO, she has everything to lose and nothing much to gain at the debate. Love it. She can't rig her way out of this. When she starts coughing, I hope Trump will go all concern troll on her. Offer that she is mentally weak and physically feeble (exact words) and that she should be allowed to take a break. If he wants to go snarky he could suggest that she suspend her campaign...for the sake of the country.
Trump can be all concerned by asking, “is there a doctor in the house?” It’ll be great.