Wahnsinnig (Kirsten Bischofsheim) is a student in Whitman cottage.
The story says her code name means "crazy" or "reckless". The Mannheim police forced that code name on her after the incident with the street gang and the steamroller. The author says he originally thought it only meant "reckless". (WOG in comments on the story).
On 2016-09-09, at the presumably) Emerson - Dickinson mixer, Erica notices the European Promotional League student club. When she introduces herself, the students notice her code name and say Kirsten will be interested in her.
Later that evening, Kirsten returns to her room in Whitman, her evening ruined by the news that someone else had scored the code name of Eisenmädel. She calls a friend in Germany to have him hack the government computers to dig up what he can on Erica.
On 2016-09-23, Kirsten pulls the trigger by tarring Erica with Baron Dämmerung's misdeeds. Erica crashes and her RA, Milena. Then Milena discusses the case with Elspeth Plimsoll, the assistant dorm parent.
High level Exemplar or something. At one point she throws an inoffensive cup away, not caring that it lands ten miles away and wrecks a car.