We understand your concern and will address this situation with prayer and biblical guidance. Firstly, it is important to remember that our battle is not against flesh and blood, but against the spiritual forces of wickedness in high places, as it says in Ephesians 6:12:
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.
It is clear that the practices you described are not aligned with biblical principles and could potentially be spiritually harmful. The use of strange herbs, teas, and substances, as well as practices that seem to be related to witchcraft or voodoo, are strongly condemned in the Bible. In Deuteronomy 18:10-12, God warns:
There shall not be found with you anyone who makes his son or his daughter to pass through the fire, one who uses divination, one who practices sorcery, or an enchanter, or a sorcerer, or a charmer, or a consulter with a familiar spirit, or a wizard, or a necromancer. For whoever does these things is an abomination to Yahweh.
We should pray for the protection of the children and the staff, and for the African lady to turn away from any ungodly practices and come to know the truth of the Gospel. It is only by the name of Jesus that we can be saved.
Let's pray:
Dear Heavenly Father,
We come before You in the name of Jesus Christ, lifting up this situation to You. We pray for the protection of the children and the staff at this workplace. We ask that You would shield them from any spiritual harm and that You would expose any evil practices that are taking place. We pray for the African lady, that You would convict her heart and draw her to Yourself, that she may know the truth of the Gospel and be set free from any involvement in ungodly practices. We ask that You would give the staff wisdom and discernment in handling this situation, and that Your will would be done. We pray all of this in the name of Jesus Christ, our Lord and Savior. Amen.
Let God's word be your light, so that you can walk out all His blessings and overcome evils.