Why should she, all we can learn is that she has no memory and since there are no teleprompters or aids to hold her up how will she survive. Also since she ha a lead over Trump all that can happen is for her to lose that lead anyway, or pee herself again and spend an hour wiping in the bathroom again...................
I would question whether she actually has a lead. Plenty of polls are showing Trump first, and once the methodology is actually looked at it becomes clear that those polls have a better methodology.
The moderators of the debate are completely in her pocket so yes, she will debate. Too bad the American people are too smart to not observe the bias... Her corruption will be made visible for all.