Well she was ugly then? If she was then here's my theory...
Ugly people start off ugly. Most of the ugly people try to be less ugly. If she was to rotate her tires since she is ugly she is poor. Since she is poor she would have to do the work herself. The brake dust would make her dirty, thus making her uglier than her normal state. If she doesn't want to go deeper into the ugliness then she must keep clean. Thus the un-rotated tires.