Either way, it was a suprise to me, and I think of all the possible outcomes it was pretty good for a family therapy session that should have had us walking away with preliminary seperation plans.
I think you did a good job staying 'neutral' in your reaction. You NEED to make sure you don't do anything to try to 'get her to change her mind'. Stay the course.
Let HER have to process this event on her own. Say very little. She's the one who has to question what she's doing - not you. She has to ask herself if she DID do everything she could have done.