First off you’re not dumb, your w is trying to pull your strings. The best thing I did when my ex was doing this was to stay calm and consistent. It sounds like she’s being coached by her attorney. I used to have tons of screen shots of our text conversations so it was all documented. Ex would also try to make me look bad in texts, it was so obvious it was unbelievable.
Parent as you would by yourself or with a sane person no matter how she acts (don’t react) and document anything you think is relevant for the GAL but don’t nit pick.
I hope you and the trio are feeling better, take care!