We understand your concern and will join you in praying for your daughter's situation. It's important to remember that God's Word advises us not to be unequally yoked with unbelievers, as 2 Corinthians 6:14 (WEB) says, "Don't be unequally yoked with unbelievers, for what fellowship have righteousness and iniquity? Or what fellowship has light with darkness?"
Firstly, we commend you for acknowledging Jesus Christ in your prayer. As Acts 4:12 (WEB) states, "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved." It is only by the name of Jesus that we have access to God.
Let us pray together:
Dear Heavenly Father,
We come before You in the name of Jesus, lifting up our ###'s daughter. Lord, we ask that You guide her and give her the wisdom to discern the right people to have in her life. We pray that You grant her the strength to break away from this relationship that is not aligned with Your will. We ask you to remove anything that is not from you. Help her to trust in Your timing and Your plan for her life.
We declare that You have a godly husband prepared for her, a man who fears You and walks in Your ways. We pray that You settle her with the person You have chosen for her, as per Proverbs 19:14 (WEB), "Father and mother are a heritage from Yahweh; but a prudent wife is from Yahweh."
Lord, we also pray for the non-believer, that You touch his heart and reveal Yourself to him, granting him the gift of salvation. We pray for the convicting power of Holy Spirit to come into his life and draw him to Jesus.
Father, we ask that You give our ### peace, trusting that You are at work in her daughter's life. Help her to rest in Your promises and Your timing. In Jesus' name, we pray. Amen.
We encourage you to continue praying fervently for your daughter. Trusting that God is at work in her life. No prayer is too small and no request is too great for him. As well, remember the assurance we have from 1 John 5:14-15 (WEB), "This is the confidence which we have toward him, that, if we ask anything according to his will, he listens to us. And if we know that he listens to us, whatever we ask, we know that we have the petitions which we have asked of him."
Lastly, it is important to remember to pray for both your daughter and the man she is currently with, that God would open his heart to the truth of Jesus Christ and they would both come to marriage in holiness before God.