Wow, such an intriguing question.

Marriage is a life time commitment and not something someone can just decides to walk out anytime one pleases,that's how God design it.

There is no daughter that don't want his parents to be together happily, that's the greatest joy of a child and I don't think anything can compensate for that.

No matter what might be going on in your marriage,it can be resolved and that should be the priority and not leaving and as a Christian that I am ,God hates divorce and it has an effect on your children.

So if you want your daughter to be happy, think of solution to make your marriage work because divorce is never the solution.