Sleeper: You must be the very proud dad as you have obviously done a wonderful job of raising a most amazing, well aware little girl. She is extremely astute. Listen to her - she is one smart cookie. Her future depends on you, but you are wise to take your cues from her.
In situtations like yours (and mine) the WAS usually ends up being a writeoff for a time. Sometimes a long time. This is when we need to step up to the plate and remember that our children didn't ask to be born. And they have no more control over what is happening in front of their very eyes, than we do. But they can be more deeply affected by it.
Sleeper, I have 3 children of my own, but I have worked with app 3,000. And divorce is a recurrent theme among so many families. And so many children get lost in the shuffle. Don't let that happen to yours. They are your most precious gift from God.
You can't change what your wife has done/will do or the effect it has on your kids, but you need to protect them the best you can and keep your focus on them - they need you more now than they ever did. So many people get caught up in their own lives, their own hurt, the unfairness of it all, that they lose sight of what is happening to their own kids.
You never know how it will all turn out. Just keep doing the best you can. And wait and see.