Ok, that is good, but I can imagine more horrible ones. Replace screwdriver with a length of barbed wire, that you stick up her butt, out her mouth, and then drag it back and forth. And instead of taking a crap on her face, pee on it instead. The acid from the urine will have a better effect. And instead of using rats, reach your hand in and pull out her insides, bit by bit, and feed the entrails to the pile of rats.