User blog comment:Corbierr/Possible reasons for Amber's disappearance/@comment-3083473-20121201195720/@comment-4816103-20121201201510

Alright, the no repeats thing does kinda rule out 1. But it's still the best reason for Amber leaving.

Maybe Nina needs her help or something so she leaves to help her? That could work for both 2 and 4.