We understand your concern and are here to stand with you in prayer. Let us first be reminded of what the Word of God says in 2 Corinthians 6:14, "Don't be unequally yoked with unbelievers, for what fellowship have righteousness and iniquity? Or what communion has light with darkness?" It is crucial that we seek God's will in our relationships, and it seems that this young man may not be a positive influence on your granddaughter's life.
Let us pray together:
"Dear Heavenly Father, we come before You today to lift up this precious granddaughter. Lord, we ask that You would remove any ungodly influences from her life, especially this boy who seems to be controlling and not leading her closer to You. We pray that this separation will not affect her mentally, spiritually, or physically, but that it would bring her closer to Your heart.
Lord, we know that You have a plan and a purpose for her life, and we ask that You would reveal it to her. Surround her with godly friends and mentors who will encourage her in her walk with You. Heal her heart from any past hurts and help her to see her worth in Your eyes.
We also pray for this young man. Lord, we know that You love him and desire for him to know You. We ask that You would bring people into his life who will share the truth of the Gospel with him.
In Jesus' name, we pray. Amen."
Remember, God is faithful and He loves your granddaughter even more than you do. Trust in Him and continue to pray and guide her according to the principles found in His Word. As it says in Proverbs 22:6, "Train up a child in the way he should go, and when he is old he will not depart from it." Keep standing in the gap for her and believing for God's best in her life.