I imagine it as a private boarding school called The Crystal Academy that is run by an overbearing headmaster called Headmaster Sombra. It would begin with Cadence getting hired at the Crystal Academy as the school counselor. She would then see how much the school sucked and overthrow Sombra and become the new Headmistress.

She would do this with the help of her husband Shining Armor, who is a cop. They met when her identity was stolen by an anonymous hacker called "Chrysalis" and her credit scan crime ring called "The Changelings." Shining was the cop assigned to Cadence's case.

I actually have a lot of ideas about this and would be willing to give them to someone that wants to write a fic about it. If your interested just PM me.