Dr Ted Noel explains:
https://www.youtube.com/watch?v=582fpY_Xmwc
He's convinced she has Parkinson's disease.
The problem is, Parkinson's drugs lose effectiveness the more the patient takes them, to the point that a dose won't last long enough for a debate. The solution is for her to take a "drug holiday" (in seclusion of course), so that when she resumes taking the drug, it will last long enough to get through a debate without symptoms showing.
If Trump. or circumstances, could do something in the debate that would trigger one of her seizures on national TV, she would be toast.