So I predict she'll say a bunch of nothing like "Immigrants should be able to work, be safe, and contribute. I applaud the President for taking on this issue but have concerns about the methodology he is using because it shifts the focus to him and his powers rather than about them. We need to move the debate forward in a way that gets us to a solution for the millions in need. As President I'll do that!"
So she likes that it's done, doesn't think doing it by executive order is wise but takes no position on if it's illegal, and of course she'd have been smarter about it. My prediction.
I can already see, say Ted Cruz, holding up a pen during the debates and say: "In my first day in the White House, I will take THIS pen and sign an executive order that cancels the current ILLEGAL executive order. Would you like to borrow this pen, Hillary?"