Regarding the posts asking why her family didn't report her missing sooner:
I think they reported her as soon as they "felt" something wasn't right.
I have a 21 year old daughter and while she is responsible and level headed, if she wasn't home in the morning, I would be a little concerned but would assume she had spent the night at a friends house. I wouldn't automatically think she was missing. I would then call her cell and when I couldn't get ahold of her, I would assume she was still sleeping. I would still be thinking that she would show up to graduation and then when that didn't happen and when her friends haven't heard from her since the night before, then I would freak out...I think this is exactly how it happened with MS's family. I don't think anyone can blame them for not reporting her missing just because she wasn't home at 8:00 in the morning. She's 21 and it was her birthday weekend, I would automatically assume my daughter had drank too much and spent the night somewhere.
Keep Calm and Find Mickey!