I have to double-check this, but I'm pretty sure Luke's last name is Skywalker, not Amidala. So... yeah. If that chick from the TOR comics has anything to do with Bassie, then someone's got some real creative retconning to do.
As for your original question, I don't think it was ever mentioned what she was doing. Maybe she got stuck in traffic on her way to the meeting, or her alarm clock didn't go off. Heh, who knows.