just remember,
don't get angry,
don't drop down to her level of arguing,
walk away from the argument,
walk away from the argument,
walk away from the argument,
I'm telling you this because the storm is coming,
I don't want to read tomorrow that you got into a big argument with your wife, you will just stand firm and let her know that you've changed your mind and you are not moving out, if she wants to move out because she needs space, she is free to do so, in fact she probably should move out since she wants the space so badly but you've decided you are staying in your home with your kids, that's where you need to be and that's all there is to discuss.

I agree on the texting, it's good for quick messages, etc. but not for carrying conversations, that needs to be done on phone or better yet in person.

If she is "stewing", it isn't your fault, it's her inability to control her emotions but you are in control of your emotions and you won't drop down to her level.