Backstory is interesting, because the girl had bullied her in person at school. GF never identified the girl on Twitter only saying "Some bitch blah blah at school today". But because she mentioned the school name, the dean found out and now wants to talk to her.
There's apparently a policy against certain language at the schools which is enforced by the very highest people.
Fortunately shes defending her right to freedom of expression (as any lawyer-in-training would) and refusing to delete the tweet. But the thought of students having to censor themselves because they are now a member of a school (which they paid $50k+ to join) is scary.