I personally do not feel that you can stick to it. If you send this letter or give her the speech......and then you backslide, that would be worse than never saying anything. You have been wishy-washy too much and I just don't see you being strong enough to carry it off. Then there is your little girl to think about. She has written a letter to her step-mom and crying for her b/c she misses her so much. Do you think you could deny your D that? I'm just saying that you need to give this a few days to think more about it before you give her the speech.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!