She's trying the trick she used on Bernie - trying to put the debates at a time nobody will be watching.
This is what the frontrunner does. Does she consider herself the frontrunner? After Trump backed out of a debate with Cruz before Iowa, can he really complain if Hilary doesn't take the debates seriously?
Who do the debates help/hurt more? Hilary will likely be frontrunner if Trump's post-debate bounce goes away.