More info:
http://www.madison.com/captimes/news/stories/71518.php
One of my sisters told me that Audrey had been dealing with depression (I'm not sure if she read this/saw it on the news or knows the girl personally) so that could play into what happened. I wouldn't be surprised if there were some other mental issues at play. However, it's still really sad/scary/frustrating/sick that she could do that.
I have known how she feels in the "I just wanted to be alone" thing and I know many many other people who have, and none of them have pulled anything like this. Not to mention that getting caught pulling a stunt like this isn't going to make you feel any less alone -- people feel really manipulated now. I wouldn't be surprised if she transfers again/takes off from school entirely.
And no, I'm almost positive she's not Greek (unless she joined during spring rush).