Legal or illegal, people do drugs.  Heroin, coke, etc., are not legal, yet there are plenty of people doing that garbage.

Personally, I'm all for legalization and regulation of all drugs.  America needs to mature and face its demons.  Sweeping them under the carpet does us an injustice.  We need to grow the heck up and face facts who we really are.

Yes, it's possible the girl is on something.  Could even be she's on prescription meds.  We don't know.  What we do know is she's a minor, and it's apparent her parent(s) don't have a handle on this....which is where the real problem is.