Ranking the theories about her behavior from the theory i most want to be true to the theory i least want to be true:
1. She wanted to be a lady on the first date so that she could really get crazy on the second date
2. She had to poop really badly
3. She is a super hero (this could be number two, depending on her super powers. If she can make herself look like other people - xmen/mystique style - then this is number one)
4. She dates online and prefers short first dates
5. She is a fun hater