Evil Bitch Monster From Hell

I have this client whom I shall call the evil bitch monster from Hell. Now I know that this is the antithesis of therapeutic. I'm way past therapeutic with this little shit.
A little bit of background is in order. The evil bitch monster from hell entered the facility about four years ago. She has some mild mental retardation a dysfunctional family and was molested once by her step brother. She has more attention from staff, family, mentors and special programming just for her. She is the most self entitled little snot I've ever met. Also she is incredibly assaultive but there's nothing we can do about it even though she's 18, because the court has declared her incompetent (which shes not). She even threatens "I can hit you and there's nothing you can do about it". It's infuriating.

This evening she was not following directives, and trying to do unnecessary laundry 20 minutes after her bedtime. I told her no, and that she needs to work on her time management. The evil bitch monster from hell started screaming in my face and posturing at me. She eventually went up to the intervention unit where she demanded that I give her a hug. When I refused, explaining to her that I would not hug her after the way that shed been treating me, and that when she was having better behavior I would be happy to give her a hug, she sat down in the middle of the hall and started screaming. I just walked out. (it would be different I this was not a daily attention seeking occurrence). Later, my co-worker D.V. Called and told me that she spent the next 45 minutes crawling between and around his legs. She then started licking his shoe. Gross.
She's fricking 18 and DECIDES to do this for attention.