My siblings, in their 20's and 30's still think that my parents could work through the fact that my "dad" was psyically abusive towards my mother, and (after they divorced) me... to the point where I can't deal with angry men and will dissociate to this day.
They want my parents to get back together in spite of all that my "dad" did to my mum and I.
I was reduced to cutting him out of my life as soon as I was old enough to do so and I haven't been able to successfully re establish contact with him without dissociating since I was 18.
He's seriously ill now and not expected to live for much longer. My family wants me to establish a relationship with him, but I just can't do it when exposure to him not only causes me to dissociate, but it drains me for days afterwards.
As nice as the idea of having your parents together is in theory, in practice, it's just not possible or practical in every situation.
It sounds to me that your daughter needs to know that the fact that you are no longer with her mother is the best outcome for you all under these circumstances.