People here sometimes reference Disney Dads, in a baaaad way. Like they bought someone else's kids Legos to get in points and stuff.
So ..... not saying be a Disney Dad. Saying be the best, most fun, quality time Dad in the world. Kids smell the difference, even at Disney. Wherever you go, they want you to totally be there - "with them". Not talking about her or OM, or Legos someone else bought. Of course they may mention Legos, at which point you suck it up and make that feeling pass. Then get right on with the business of making your own fun. You aren't competing with anyone but yourself and your kids are rooting on you to win. Do they like sandwiches cut out in the shape of hearts, stars, (think cookie cutters) or smiley faces by hand? Do they like pancakes poured and made to look like Mickey Mouse head with choc chip and whip cream face? Or maybe they like to watch you screw up trying to do things for them you didn't try before, and laugh about it together. Puzzles? Paper masks to wear around the house? Oh yeah, if it isn't electronic it's no fun anymore. If so, what electronic games do you need to learn as the kids kick your rear?
The other thing. Start the mental image now that W will be instantly transported to another galaxie far far away from any meaningful life during this time. While there, her brain may be probed or she may recieve telepathic images of being happy. It isn't real and she's only fooling herself. If that truly is the way she wants to live her life, the kids need to spend as much quality time as possible with you.