Thanks guys, I was feeling disheartened, still am really I suppose. The irony in the situation is that she said she really, really, really values monogamy because her father and I were so bad at it while she was growing up. We both had affairs in what was a very rocky relationship. If we had of been polyamorous, our marriage may have worked and I wonder if it would have changed her point of view.
My other daughter is more accepting, still thinks we're "abnormal" and she has also chosen a conservative Christian life.