Many reading this are weeping empathetically. They've walked this road, or are walking it now. Their own children were or are disobedient to the Word, somehow siding with the world which believes their conduct is totally acceptable—they say it's simply a difference of opinion. But it's not. It is sin. The values you tried to instill in your daughter somehow have been set aside and replaced with the mantra of this world's system.
None of us wants to close off our relationship with our adult kids—and we don't have to. While we may separate ourselves from their lifestyles, we want to include them in our lives. But you can't allow them to sleep together under your roof, whether it's a daughter living with a young man, or a son who has chosen to have a homosexual relationship with a friend. You accept and love them, but you don't bow to their insistent wishes to compromise your own values by allowing them to sleep together in your home. I think they should know they are invited to come to your home for dinner and regular family gatherings.
Your daughter already knows you don't condone her relationship with her boyfriend, but she also needs to know that she is loved and can always come home to visit, even with her boyfriend.