I just re-read your story and IMO that fantasy world is going to come crashing to the ground real soon. Moving to a new state for a man she barley knows with three small children. Unlikely chance that works out.
I wholeheartedly agree and have discussed this with friends. Almost no way this works out. It's pure fantasy and la-la land stuff. It makes no rational sense but WW is not rational right now.
The OM lives in a state where he has to be separated from his wife for a year before they can even file for divorce. OM has been kicked out of the house 3 times since the A and from what I've been told by WW, OM's wife is pissed off and is going to drag OM through hell and back. That means he's going to be dealing with this stuff for the next 1-2 years at least.
Then you have WW who has literally never lived outside a 50 mile radius of her parents' home. And she would have to leave all friends and family she's ever known for OM who she has only been with in person less than 15 times and those were primarily happy hours, dinners and sex on work trips when there is no real life responsibility. When I challenged WW that she doesn't really know OM she tells me about how often they texted and called each other and how great she knows him. She is going from having no kids and having a carefree life to be the stepmom of three little kids who hate her and all their events/functions that OM will go to. WW is incredibly close to her 2 sisters and their 5 little kids. We go to all their birthday parties/events and have Sunday dinners with WW's parents at least once a month. WW will be missing all that. There is no way that relationship won't be subjected to incredible stress from the get-go.