I dread this but know that it is something I must do.
No, of COURSE you don't, IDU. There's a reason they put that little "v" in between the names of the parties in a legal action. It's adversarial -- by design.
What do you do? Right now, as everyone else has said, NOTHING. You've stated your boundaries, she has violated them, and now you must begin moving on. I do think you should lock the house up tight next time, turn all the lights out, and if you have one, arm the security system (after changing its password, naturally).
My dad used to yell and holler and scream at us when he was mad. His brother -- my uncle -- was exactly the opposite. After my cousin shot-putted an old croquet ball he had found outside once right thru my uncle's station wagon window (safety glass shattered EVERYWHERE!), his dad didn't speak to him AT ALL for all that evening and all the next day.
"Isn't he going to YELL at you?" I asked my cousin.
"No, but I wish he would," he said, scared out of his mind. "It'd be easier that way. It's much scarier when he's quiet." Be like my uncle.