Could be this girl was exhibiting signs of being intoxicated with some unknown substance. There's enough experience with that sort of thing to be quick on your toes around prisoners.
We had a young kid across the river in Maryland who managed to pull a pistol out of a custodial officer's holster and kill him and his associate while he was still cuffed.
While she is face down on the floor and her left hand is being held behind her back? This isn't The Exorcist.