Whatever happens with your wife don't give up on your daughter. Coming from a daughter with no relationship with her father you have to keep trying and trying, your relationship with her will influence all of her male relationships in her life. I realize now that I seek out men like my father who are distant and not really there. You want her to have a loving happy relationship for herself and sadly your relationship with her will be a big factor in that. It is hard being a teenage girl even in the best of situations she will push you away. Don't just focus on your son and leave her out. Keep trying. Show her you love her even if you don't feel it back. She is the same little girl on the inside as she was when she was 5 looking for her daddy's love and time.