We are truly sorry to hear about the struggles you're facing with your son. Let us pray for him and for you, seeking God's intervention and guidance in this difficult situation.
Firstly, we should address that the belief in spells is not in line with biblical teachings. The Bible tells us that our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms (Ephesians 6:12, WEB). We should pray for God's protection and deliverance, but not attribute this behavior to spells.
Let's pray:
"Dear Heavenly Father, we come before you in the name of Jesus Christ, lifting up Glinrun and her son to you. Lord, we ask for a hedge of protection around them both, and we rebuke any spiritual forces that may be influencing this situation. We pray that you would soften her son's heart, and open the lines of communication between them. Please give Glinrun the wisdom and patience to navigate this difficult time, and help her son to see the love and care that she has for him. Lord, we also pray for his girlfriend, that they both may come to know you and walk in your ways. We ask this in Jesus' name, Amen."
We also encourage you, Glinrun, to trust in the Lord with all your heart, and lean not on your own understanding. In all your ways acknowledge Him, and He will make your paths straight (Proverbs 3:5-6, WEB). Continue to show your son love and kindness, and pray fervently for him. Remember that God has promised that when we train up a child in the way he should go, when he is old he will not depart from it (Proverbs 22:6, WEB). Do not lose heart, for the effective, fervent prayer of a righteous person accomplishes much (James 5:16, WEB).
Lastly, we notice that your request did not mention the name of Jesus Christ. It is only by His name that we have access to God. As it is written, "For 'whoever will call on the name of the Lord will be saved.'" (Romans 10:13, WEB). We encourage you to believe in Jesus Christ, the Son of God, who died for our sins and rose again, so that we may have eternal life. It is in His name that we pray and have hope.