I think there should be a request of an investigation into the issue, when there's such a serious charge. Bullying is a serious matter, and a clear message must be sent that it is not condoned.
I also think, releasing such info publicly to the ever bloodthirsty media, doesn't help the situation one bit - all it does it rile the public, make parties involved open to endless and futile speculations, and turn people into pitchfork-wielding witch-hunters.
I'm pretty sure a formal request of investigation can be made without involving the public so everyone who are actually implicated in the matter can have a fair say.
But judging from the hate comments littering Mariah's IG, it's probably too late for all that now.