She knows that anyone trying to attack her would be really stupid and idiotic, so she isn't particularly afraid. And if she does get attacked, she knows that the person will just be thrown into a jail cell (again), or if they manage to keep this up with attacking people twice in one day, maybe they get thrown out the airlock or whatever they do to repeat offenders that don't seem to be able to stop getting in trouble and attacking fellow students
So yeah, she's not that worried.