I urge you to prayerfully reconsider your advice that a Christian should go to a gay wedding. How can a Christian celebrate something that is an abomination to God? How could one even congratulate this sin? There are many ways to show Christian love to someone involved in the sin of homosexuality, but I can’t believe that attending a so-called wedding is one of them. Isn’t it more loving not to attend?
The woman’s husband is a friend of the gay couple, and his daughter is bearing their children. She’s the only Christian in the group. If the opportunity to share the Gospel ever presents itself, will she have more credibility as one who demonstrated her love by attending or as one who did so by staying away?