I think you are doing very well in handling your situation.
I'm glad to read that you are getting cc's on the correspondence between the attorneys. I understand your concern for her, but she's made this mess and is now having to face the consequences of her actions. It's very sad and a shame because she's got a great husband and a couple of beautiful kids and a nice home that she walked away from.
I think you did the right thing with your son's birthday. He's not going to be a child much longer and the teen years are coming quickly. They grow up so fast and you want them to enjoy their childhood for as long as possible.
Please travel safely and enjoy the time you spend with your family. Leave the MLC mess at home and just try to enjoy the time away and enjoy eating food that others prepare for a change.
Happy Thanksgiving!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.