Just some thoughts.
First, I wish any/every poster would quit second guessing the brother's actions re: putting Morgan's photo on his FB default and sleeping in her bed. As the majority of us have already expressed, he most definitely put the photo up to honor her. As for sleeping in her bed, I can understand this. Someone said if they were him they'd be out there looking, but really, how can you know WHAT you'd do if a sibling were missing?? Or how you'd react? If one of my sisters went missing I'd want to be sleeping in their bed too, just to feel "closer" to them. The poor guy is probably a wreck. And where exactly is he supposed to be out searching? Just walking around randomly and hiking in the woods? Virginia is a pretty big state; she could be anywhere. Her brother is grieving; give him a break. This isn't the time to be judging him.
Second, these girls she was with don't sound like real friends. Maybe they were jealous of Morgan; I saw a picture of the 9 of them together and clearly Morgan has matured into a real knockout. The others, not so much. God, that sounds horrible and shallow but just something I have a feeling about. Who knows? Something made them treat her so horribly as to leave her alone out in the cold and leave C'ville without her, in her own car. Even if she did have a tiff with one/some/all of them, it seems the minute she called them/they called her and it was revealed she was locked out of the arena alone any petty argument would be forgotten and a real friend would go to be with her or help her.
There are really only two options at this point:
1) She made secret plans with someone no one seems to know about to run off together (I'm hoping, but less likely considering her probable intoxication/falling/taking pictures - if she did have a plan to meet someone and run off her mind would be on that - not getting high and taking photos.)
2) She was abducted/murdered and her body is hidden in probably some rural area just about anywhere in Virginia, and will probably only be discovered if they catch the kidnapper and he reveals all, or someone happens to stumble across it.
Like many here, this case has just "gotten" to me for some reason. I hope Morgan is at peace, wherever she is.