All completely understandable reactions on her part if she's not getting what she wants out of mediation/D. Also, the pent up feelings about the entire MR/D are going to come exploding out as well. My advice is stick to your business and your plans, and give her lots of space to go through her feelings. She'll come around, but you are right - she needs to work through her own grief and pain in her own time and it's not yours to "fix" or make better or soothe - although I'm sure you wish you could at times. Anyone who has been married wants to help their spouse see the other side of pain, but the process of detachment is to not take away or process their feelings for them, however much empathy we might have. It is part of both people's grieving process. It hurts, and we don't know what to do to help the other person, so doing nothing is the best plan. Like Stronger always says "Sit still and Shut your mouth!"