Well, Benjy was something. Used to a life of fighting, boxing, swearing blackmailing people, oh, and having fun. She never expected her sister actually doing something about it, so when she was sent to William's Fate military "exclusive for boys" academy she couldn't even explain how happy she was. She could get into fights not being punished for it! She wasn't very aware of the trap that she was getting dragged into, tough.
An there still was this tiny little fact that she wasn't a boy.