At this point, with papers filed, I think she is doing some arithmetic in her head. Finances, how to pay for things, how much maintenance she is likely to get. She's maybe realizing she'll need a job, a fulltime job. Maybe she is realizing that without a partner who provides an income, she cannot follow her desired vocation of being a fulltime mom. Well, not exactly, it's just that in addition to being a fulltime mom, she will have to work, she'll have less time to be "a mom", and she'll have much less money, and that means fewer vacations, smaller house, less outside help, etc.
I probably shouldn't pipe in, but I just can't help myself. It's possible that she did the math. It's possible she really wants to be a full-time mom and not work outside the home. But isn't it equally likely that she considered all this before she wanted out of the marriage, and despite all that she still wants a divorce more than she wants stability? That's the thing....the desire to leave outweighs those concerns. She had all this stuff you are offering before. What you need to offer is this new you that is the better partner and hopefully she'll see that. And then she gets the bonus of stability. Would you really want her to come back solely because she can't make it on her own or because she needs you to provide the living? Do you want to be her fallback plan?
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt