IA Child, I think it would take great thespian skills to pretend validation when one feels otherwise. I get the sense from Edie that doing so would be a great struggle.
I think to increase insight around her reactivity and change her interpretations and judgments about her H's comments will lead to a greater likelihood that she will be able to perform the DB behavioral strategy you recommend.
I agree that she must change her behavioral response to her H, but insight about her reactions will increase the likelihood of her being to make that change.
Insight and behavior change complement each other. Of course, whatever combination works for Edie is the correct approach.
CL
CL 53 W 54 M 20 yrs. 03'-09' Separation + Old Patterns + GAL 10-14' Piecing
"The Master allows things to happen. She shapes events as they come."