Well I've always been taught NEVER to do that. Always leave yourself a 2 week notice to make it look better on your part because you never know if it comes back and bites you.
But I'll be completely honest, when I leave I'm telling her off one way or another, I may just wait till the last shift or somethin like that. Or like you said just call her and lower the boom on her.
However if you think it's the right thing to do to just haul off on her and quit. By all means I have so many ways in my head to make a grand exit and let her know what a two faced back stabbing evil insensitive pathetic pos she is. God that felt good just typing it. Mmmmmm