She has played all her trump cards and she's still not happy. She's remarried and she's still not happy. She might not ever be happy. That's no longer my problem.
Allow the hurricane to arrive and blow away the old aspects of your lives. Reset your expectations and parenting lives around the love and support of your children. Then, even if things don't work out with the marriage, the closeness and love that you've established with your kids, becomes the strength and bond that guides your relationship even after divorce.