If Hillary shreds the Constitution, who is going to do anything about it? Would she be impeached? No. She could and would do whatever she wants. She is a Marxist and totalitarian at heart. Her followers are true believes. But that's okay. Keep saying that she would be better than McCain. Can anyone imagine her Supreme Court choice(s)?
If, if, if. . .
She could do a lot of things or wait for a Republican successor to implement them just like her husband did.
Will you sit by silently and peacefully if she tries to run the country as a dictator using executive orders?
I won't, but neither will I put the likes of a psycho like McCain in office just to stop her.
She couldn't live within the safe confines of the White House forever, nor would she necessarily be safe there if she attempted the things you suggest.