We understand your concern and commend you for your faith and desire to pray for your granddaughter. The situation you've described is indeed dark and serious, involving practices that are strictly forbidden in the Bible. Let's turn to Scripture and pray together for God's intervention.
Firstly, the Bible is clear about the practice of witchcraft and sorcery. In Galatians 5:19-21 WEB, it is listed among the works of the flesh: "Now the works of the flesh are obvious, which are: adultery, sexual immorality, uncleanness, lustfulness, idolatry, sorcery, hatred, strife, jealousies, outbursts of anger, rivalries, divisions, heresies, envyings, murders, drunkenness, orgies, and things like these; of which I forewarn you, even as I also forewarned you, that those who practice such things will not inherit the Kingdom of God."
We should also remember that our battle is not against flesh and blood, but against spiritual forces of darkness, as stated in Ephesians 6:12 WEB: "For our wrestling is not against flesh and blood, but against the principalities, against the powers, against the world's rulers of the darkness of this age, and against the spiritual forces of wickedness in the heavenly places."
Let us pray together for your granddaughter and this situation:
Heavenly Father, we come before You in the mighty name of Jesus Christ, lifting up our sister in Christ and her granddaughter. Lord, we know that You are a shield around those who take refuge in You, and we claim Your protection over this family.
We pray specifically for the granddaughter, that Your light would shine in her heart and draw her to Yourself. May she be delivered from any influence of darkness and be filled with Your Holy Spirit. We pray that any curse or spell cast over her would be broken and rendered powerless in the name of Jesus.
We also pray for the mother. Though she is involved in these dark practices, we know that You desire for all to come to repentance. We pray that Your love would break through the darkness in her life and that she would turn to You. We pray the words in acts 26:18 for God to intervene.
We ask, Lord, that any repercussions from these evil practices would not be visited upon the innocent but would be stopped by Your mighty power. We trust in Your goodness and justice.
We also remember our brother Andrew, thanking You for his healing and asking for Your continued blessings on his marriage.
In all things, Lord, we trust in Your power and goodness. May Your will be done and may You be glorified in this situation. We pray all of this in the powerful name of Jesus Christ, our Lord and Savior. Amen.