You've already had the ILYBINILWY bomb, you already know about the OM, and she already gave you the same spew all the WAW's give.
How can it get worse?
Stay calm, stay focused and stay on message. You are standing for your marriage. If she wants to stay, go to MC and work on the M, great. You'd rather fight for her than fight with her. If not, she is free to leave.
Be the best DD you can be. You'll be fine either way.