Basically the people involved are saying it's a joke, that the little girl "Cookie" was just messing around.
I've got kids, I've done X (in my wilder past)...kids who are doing something for a 'joke' start giggling once they get a reaction. That little girl was on SOMETHING in that video. If a tox screen came back clear, I'd be surprised. The conversation in the back ground talks about how they gave her exstasy, but the girls involved are maintaining to the police and child welfare officials that she was joking and was never on anything.
They live in the Houston / Huntsville area of Texas, and the authorities are involved.