You might want to come from a position that is supportive within reason and try to work to defuse things if you feel Mrs. Dev is getting a rise out of your exchanges.
Yes, a bit of validation goes a long way. Perhaps you might want to take a peek at my thread in the Big D forum. Hint: Ms. Wonka sent a response this morning.
Back to you....
It is clear that Mrs. Dev is feeling frustrated at some certain things that appear not to go her way. I am not sure where she's feeling BLOCKED...pun intended.
You might want to soften your approach a bit more when doing text and/or email exchanges. Such as "what are your thoughts...is that what you (or I) understand here?", "perhaps I misunderstood...." You get the idea, Dev.
I am sensing some resentment on her part in that she views you as having a great support system in place such as your Mom and friends willing to help out with kiddos and she apparently feels that she does not have someone she can rely on in a pitch. Doesn't she realize that this is what a separation is actually all about...maybe she thought she'll be doing happy hopscotches away from you. Then reality bites her in the butt and she isn't liking it one bit.