Time to shut off the phone and internet service.
It's too late. Damage is done.
Really disappointing to see this play out. But this is result of bad parenting and there's no way to defend it.
People like to dump on Trump for being "coarse", "low-brow" and whatnot, but he managed to raise respectful children who are net assets to society. This 15-year-old girl is a national embarrassment.