If she does that, and he says "nope, I'm going to stay right here in the bedroom, and if you attempt to come in again I'll go somewhere else, and please put 2000$ on my account Monday?"
Then I would tell him "that's YOUR choice not mine, and a sign of your commitment to us."
This is all stuff "I" would do, just stuff to throw out at Heather and see what sticks since she's looking for ideas.
