She is wanting out as quickly as possible. She must have a new OM that she does not want to know that she is still M and wants to look like a great mother as well. Just my opinion. She does not do alone; so I do not expect that she is alone.
I'd say this is a distinct possibility...you've shown plenty of evidence that most of her actions are about how things "look"...and if you have custody..then that gives a certain impression (like...the truth!). Tread carefully. We'll be praying for you and those kids!