Of course there was little resistance. What do you think would have happened to any student who dared to suggest that this was not normal, and maybe, just maybe, "Riley" was suffering from serious psychological problems? At the very least, that student would have been suspended, forced to apologize, and ordered to attend "sensitivity training." Any teacher who dared question the situation would be out of a job.
The parents should sue the school for enabling this child and not helping HER.