I'm sorry. This stinks! I don't think there is anything wrong with that. I think what matters is what the kids see and how they experience this. It's going to be hard on the kids for their family to split up, so ultimately it's best if parents can be a united front. Wouldn't it be great if everything was just simple and smooth all the time (sarcasm)?!? Do these waywards really think hard about the impact on their kids and the long run? ... It doesn't seem they think much past when they can get their next fix from their AP; like an out of control teenager or addict!
So ignore her. You are only human, you have your reactions, and that is okay. I think you did the right thing and I don't think you should be hard on yourself. She is delusional if she thinks you guys can have a nice family dinner and everything will be "normal." That is not what happens when you have an A and rip apart your family. That is cake eating.
So try not so sweat the small stuff. In the grand scheme of things, those details won't change what she does or doesn't do. you have little control over that. So just keep doing what feels right, let her go, and focus on those kiddos. She can go and pout all she wants. There will be plenty of pouting and self-doubting in her future, and that I KNOW.
As V says, not your circus, not your monkeys.
Blu
“Forgiveness liberates the soul. It removes fear. That is why it is such a powerful weapon.” – Nelson Mandela