I understand that courts are both slow and loath to act. I also think that they move to separate kids from parents only in extreme circumstances, like domestic violence or incest. Even criminals are allowed to see their kids. Nevertheless, I think courts will step in when it comes to kids' safety. In the case of my disordered uNPD BIL, the solution was to require adult-supervised visits, as well as prohibit him from driving with the kids, and require him to pass a breathalyzer test during visitation.
Having said that, nothing really prevents my BIL from insulting his ex or his kids . . . but during in-person visitation, he's supervised by another adult. During phone calls, he's not. Little "forces" him to comply with the parenting plan, and he remains largely non-compliant with the terms of the divorce, too. For example, it took him over a year to vacate the marital home and put it up for sale in accordance with the divorce decree. He left the home in such ill repair after living in it alone during the pendancy of divorce that it remains unsold, despite listing it well below the Zillow estimated value, while he refuses to fix key issues like the A/C and septic tank. What I'm trying to say is that you should ASSUME that any parenting plan or divorce decree will involve some non-cooperation on the part of your ex, because that's the way she is.
It sounds to me like your biggest issue right now is that you can't "end" interacting with your ex because your kids are involved. Alas, I don't think you can prevent your ex from badmouthing you and spreading false stories behind your back. I'd say, try not to engage with her at all, except concerning logistics with your kids.
There's also nothing stopping her from filing claims in the courts. If you're in the US, anybody can sue anybody. But I'd think that if the suits are frivolous, you could have the case dismissed and demand that the plaintiff pay your legal fees. My ex BIL also tried to play the court system durning the custody case . . . and even though he was a lawyer, he didn't follow the process correctly, and the court basically slapped his hand. Ultimately he was found in contempt of court, and they ruled in favor of my sister, who remained the reasonable and compliant one throughout the multi-year process, always putting the kids' interests first and foremost. I wish the same for your ex and you.



