ooc;; *puppy dog face*
Well the juvenile delinquent jail/boarding school is managed by easily swayed, greedy people and they only care for money, and there's a lot involved in "educating" children in the use of magic.
And jails don't allow inmates to wander freely around the hallways, while colleges let dorm residents wander around freely.
And sure- Emma can be Di's friend from the Night Academy. But Night Academy is supposed to be a high-end, rich, private, and elite school. And Di and Erik are both from that school already- how about Emma's from a different elite school, but they're childhood friends.