GIMA, you did perfect. W must have been shocked that you found out, and that you handled it with such maturity and composure. People lay a lot of things when preparing for a D, W's friend also could have exaggerated. You'll never know, but it's good W knows you are aware if she is saying uncool things.
You are a L, so you know how to fight in court. You will handle fine. She can threaten, but you know what you can and cannot defend.
