Coming at it from another angle, when I divorced my now ex H, I did so because he had made my life hell for many years (belittling violence - slaps rather than punches - and verbal assault, he was very very good at twisting my words). My sister, who never saw that side of him, stayed in contact with him and I was bitterly hurt, although I didn't tell her. It soured our relationship for some time, and although it's now wonderful again, it still rankles. Your Dd may have been the person to end that marriage but are you truly privy as to why? There could be reasons that she may have not wanted you to know and she may, very much, not be happy if you go to this blessing. I think I'd advise having an open and honest conversation with her before you respond.