Lucy I just send dst (age 3 1/2) back to the naughty corner and start the time again. They learned that pretty quickly and stay where they are now even if they are throwing a wobbly while they stand there!!!
This little girl needs help beyond Supernanny, there is something seriously wrong with her. Even when she speaks normally there is such hatred in her voice, perhaps a counsellor or psychiatrist. I think this is a step further than just kids playing up or out of control. I'd certainly be seriously worried if my child acted in such a way, especially to a stranger.