Not that it even matters necessarily, but perhaps this LSD angle that has been brought up could explain something.
Earlier on, we read some things that referred to MH having changed schools, and was perhaps involved in something. Could it be that when she said "the man stomped her down" she was referring to getting busted for drugs? It is too bad that the Facebook page is unavailable, because the tone of her comment on fb really sounds like she was doing some experimenting.
And in the comment she "lost that sweater". Now it could be that her behavior on the night of October 17th was not that different from experiencing a bad trip. Where "things just went downhill from here" as she says in her comment about the picture. Possibly losing items, wandering outside the arena, ending up with a creepy guy.
Either way, if she was or was not on the "unicorns" that night; it doesn't matter. Because she is gone and somebody took advantage of her and its still not solved. But, we try and figure things out on here.
Ecstacy or speed could be other possibilitys. Ecstacy could have caused her to be trusting of somebody wierd. Speed could explain her reported angry outbursts.