Hi, I would be glad to try to answer your question.
Based on what you said, I think you would benefit from separating your feelings for these two women and analyzing them independently from the other. What I mean by that is you should first decide if you love your wife, and if that love is strong enough to try to fight to make the relationship work and the marriage last. It is very easy to let the promise of a new relationship cast a shadow of doubt on your existing relationship. An existing relationship will always have a tough time competing with new relationship, since the new relationship is largely made up of your expectations and ideals and even your fantasies, while your existing relationship much close reflects reality.
Only you can decide whether or not your wife and your marriage is worth trying to save. You said your wife is interested in trying to work things out. You have a child together and obviously you married her for a reason. Perhaps if you put aside thoughts of Becky for a moment you can see light at the end of the tunnel with your wife and you will decide to try to save your marriage?
On the other hand, you make some very profound statements about your feelings for Becky. It seems you have serious and deep feelings for her. The hard part, as you know, is to decide if giving up your current marriage, possibly breaking your wife's heart, causing emotional pain for your daughter, etc are all worth pursuing what you feel for Becky. Nobody can make this choice for you and it is definitely not an easy one. You sound like a man who doesn't want to end up cheating on his wife and you want to be honest with her, which is of course admirable. My opinion would be that you definitely need to do some real soul searching, decide which relationship you want to pursue, and then be open and honest in whatever path you take.
I am going to switch this over the the Q&A format since you don't appear to be online, so you may reply to me at your convenience. I hope my answers helped!