Who is this person?

Your daughter is the same person you loved before you discovered she was pregnant. You may have learned some new facts about her that you had not know (such as the fact that she has been sexually active), but she is not suddenly a complete stranger. Focus on offering grace and acceptance to your daughter because she is a human of inestimable worth made in the image of God and because she is your daughter. You are not saying that you accept her behavior, simply that you accept her. Again, you can love the person and hate the sin. Focus on listening and reaffirming to your daughter that you love her and you love her child, your grandchild. This may be extremely difficult to do, so pray that the Lord will give you His love and strength to extend to her.