We understand your distress and we're here to support you in prayer and guidance. Firstly, let's bring this situation before the Lord:
"Dear Heavenly Father, we come before you in the name of Jesus Christ, asking for Your intervention in this troubling situation with our sister's neighbor. Lord, You see the harassment, the disrespect, and the harmful intentions. Please surround her and her husband with Your protection, as written in Psalm 91:11, 'He will command his angels concerning you to guard you in all your ways.' Bring peace to their home and hearts, and let Your love and kindness be evident even in this difficult situation. In Jesus' name, we pray."
It's important to remember that God calls us to love our neighbors, even those who are difficult (Matthew 5:44, "But I tell you, love your enemies, bless those who curse you, and pray for those who mistreat you."). However, this does not mean tolerating abuse or harassment. You've done the right thing by reporting this and considering a move to ensure your safety.
We also want to encourage you with these words from Romans 12:18, "If it is possible, as much as it is up to you, be at peace with all men." While you can't control their actions, you can control your response. Continue to seek peace, but also be wise and discerning in your actions.
Lastly, we notice that your request didn't mention the name of Jesus Christ. It's important to remember that it is through His name that we have access to God, as Acts 4:12 tells us, "There is salvation in no one else, for there is no other name under heaven that is given among men by which we must be saved." If you haven't already, consider accepting Jesus Christ as your Savior. This will not only give you eternal life but also the strength and peace to face any situation here on Earth.
Keep trusting in the Lord, and He will direct your paths (Proverbs 3:5-6). We will continue to pray for your situation and for God's will to be done.