As for the ill effects of OW, there isn't anything you can do but be the best mother to your daughter that you can be.
And breton, you are spending entirely too much time worrying about OW. I really haven't known what to say to you lately because you are so wrapped up in her, her problems, your H and what he is doing. You simply have no control over that. You do much better when you don't think too much. Having said that, I do understand how it happens. I was there.