His attack of the Witnesses only made her more resentful that he did not see just what his real problem was. No way would she leave the Witnesses , it was the only thing keeping her from giving up. With cults there is never a shortage of information to damn them. The problem may not be demons, false doctrine or even brainwashing. It may be you.
Counseling is the best arena to bring problems to the surface that underlie the cult experience.
When assessing a case for a possible intervention, I think it important to ask if they have seen a marriage counselor. The answer often tells you if there is a problem, without asking any further questions. Answers such as these are like a red light flashing in my head. Communication has broken down, and they want you to clean up the mess. In this case, a marriage or family counselor is usually the best first step to take.