This is why the phrase "problematic" is useless and should be removed from the human vocabulary. Are you suggesting the teenager was difficult to deal with - or

This is why the phrase "problematic" is useless and should be removed from the human vocabulary. Are you suggesting the teenager was difficult to deal with - or actively breaking rules? Was she being a bully or just not fitting in well? You can't just label someone "problematic" and get rid of them for a minor infraction without having to support that label with something meaningful - otherwise the behavior is arbitrary.