My daughter is in a triad poly relationship?

It's never easy when a child chooses a path that's very different than what they had imagined. It's her life and there's little you can do about it. What I can tell you is that I have friends who are in triad relationships and they are very happy people. That's what you want for her right, to be happy. It'll take some time for you to adjust but what they are doing is ok if it makes them happy.