I'm pretty sure you can hire someone to execute a trust -- possibly the lawyer who created it in the first place.

I'd say the LW and their husband need to get their own lawyer. In a perfect world, their lawyer arranges a meeting with MIL and her lawyer, and they work together to come up with a trust that puts her money where she wants it to be and keeps LW and husband out of it.

If that's not possible, then any time anybody in that family contacts the LW/husband about money, LW/hosband hand them the lawyer's card and say, "This is who you talk to. It's out of my hands."

Possibly the lawyer also starts the restraining order paperwork now.