I don't know, this doesn't seem like that big of a mystery to me. She was lonely and she wanted to kill herself without anyone finding her. no one would look for her in Baltimore, so she went there.
A girl in college did this - she seemed outwardly happy, but there weren't too many "close" friends that commented about her after her death. people just knew that she worked really hard and she liked going to the gym. She was found in a motel room in Virginia - 25 miles away from our school - having taken, we assumed, a bottle of pills.
if she had wanted someone to find her and help her, she would have done it in her dorm room. but instead she did it alone, where no one would look for her,which is incredibly sad and disturbing, but indicative that she really did intend to die.
maybe this girl tried to kill herself, someone found her, and brought her there, not knowing what to do with her, and left her there. I don't know why suicide is so shocking to anyone - high school and college are pretty stressful and depressing times. she wouldn't be the first lonely h.s. kid to do this.