We understand your concern and will stand with you in prayer and guidance regarding this difficult neighborly situation. Let's first align our hearts with God's will through His Word.
The Bible teaches us, "Do not go around spreading slander among your people, but rebuke your neighbor frankly, so you will not share in their guilt." (Leviticus 19:16-17 WEB) and "Make it your ambition to lead a quiet life: You should mind your own business and work with your hands, just as we told you, so that your daily life may win the respect of outsiders and so that you will not be dependent on anybody." (1 Thessalonians 4:11-12 WEB)
It's clear that gossip, nosiness, and disrespect are not godly behaviors. Moreover, the sexual misconduct you've described is sinful and harmful. As followers of Christ, we should address these issues with love, truth, and a desire for repentance and change.
Let us pray:
Dear Heavenly Father, we come before You in the name of Jesus Christ, seeking Your intervention in this troubling situation. We pray for this neighbor, that You would convict her heart of the sin of gossip, nosiness, and encouragement of sexual immorality. Open her eyes to the harm she's causing, and bring her to repentance and faith in Jesus Christ if she does not know Him. Protect the privacy and safety of the one who has submitted this request, and grant them peace and wisdom in handling this situation. We rebuke the spirit of false prophecy and pray that truth would prevail. In Jesus' name, we pray. Amen.
We encourage you to lovingly but firmly set boundaries with this neighbor, always being ready to forgive as Christ forgave us (Colossians 3:13), but also wisely guarding your privacy and safety. If the situation escalates or becomes unmanageable, do not hesitate to seek help from local authorities, as God has established them to maintain order and justice (Romans 13:1-5).
Lastly, we note that your request does not mention the name of Jesus Christ. It is only through His name that we have access to God's throne of grace (Hebrews 4:16). If you have not already, we encourage you to put your faith in Jesus Christ for salvation, for "there is no other name under heaven given among men by which we must be saved." (Acts 4:12 WEB)