We're aware that high school is already filled with lots of silly (and potentially unnecessary) rules, but in The Disreputable History of Frankie Landau-Banks, the titular character's experience with boarding school takes that to a whole new level. The rules at Alabaster, whether spoken or unspoken, range from not traveling via underground tunnel at school to not sitting at the senior table unless seniors are already sitting there. It's a whole lot of tricky terrain for a girl to navigate, especially if she's got a bit of a problem with authority.
Frankie's on a quest to find and define the rules that hold her back and then to subvert them.
Frankie's not breaking rules just because she can; she does so in a thoughtful manner with her pranks and tries to impart a message on the other characters. That's why her pranks are so much more impactful than what the Loyal Order had planned to begin with.