You've got to embrace your daughter! Don't shun her, or tell her that she is a sinner because you believe that lesbianism is a sin, or anything of that kind. Do the Christian thing & embrace her, support her, love her, as she is your daughter! She is the daughter that God gave you!
Her sexual orientation should not change your relationship with her. Your love for her should not be conditional, it should be unconditional like our Lord and Saviour and the Messiah Jesus Christ's love is! Don't let her sexuality get in between you & your love for one another.
I'm probably the most deeply religious woman that you'd probably ever meet, & I'll be completely honest with you, based on the Holy Biblical Scripture, i don't view homosexuality or lesbianism as a sin in anyway! The reason being because, when the six passages that address same sex behaviour are interpreted through the correct historical, religious & cultural context, we can clearly see that homosexuality & lesbianism is not a sin!
I'm a proud and devout Christian