The reason is pretty easy to figure out: the time changed over the weekend. Obviously she forgot to set her clock.
So she walks in and the TA (gently) points out first that she is late, and then when she didn't figure it out, that it is actually 10:30, not 9:30. Her hand flew to her mouth, embarrassed, and we all had a few chuckles over her totally mundane and understandable mistake. She was laughing too...but then she started crying. She'd seemed fine when she walked in, but I guess the embarrassment tipped her over.
Thankfully, all her friends and family are safe (at least, I'm pretty sure all her friends are safe; it got a little hard to follow at that point), although one friend had to leave with her family, as they lived inside the evacuation zone for the ongoing nuclear accident.
There are tens of thousands of people affected by the Earthquake/Tsunami in Japan, and countless others who, although geographically distant from the disaster itself, are still close to it by virtue of friends, family, and other loved ones. If you can spare any money at all, please consider donating it through any one of these means. If you can't, please consider donating time and talent to fundraising efforts such as help_japan.
Unfortunately, this came at a time when I am overburdened with other commitments and am in a cash crunch, so I'm unable to do either. I understand if you can't either. But if you are able to: every little bit helps.
Oh, I'm sure nobody reading this does this, but to those putting down or demeaning the way in which someone chooses to help people affected by a disaster like this? Fuck you sideways. This is more important than your need to make your charity penis look bigger.