Can I attend and participate in daughters wedding?

My daughter, who has left the Church, has been cohabitating for several years with a man who has now proposed marriage. She has asked me, the father, to “give her away”. I have objected to the living together from the beginning. She was raised Catholic, attended a Catholic grade school and a Catholic college. We never gave the impression that sex before marriage nor living together was okay.
I do not wish to violate my Catholic beliefs and now am conflicted as to even attending the upcoming wedding. I believe I cannot be complicit in the life style nor the civil union. What do I do?

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