We understand that you're going through a challenging situation with your daughter, and we want to lift you both up in prayer and provide some biblical guidance.
Firstly, let's remember that God calls us to love one another, even in difficult times. As it says in Ephesians 4:32 WEB, "Be kind to one another, tenderhearted, forgiving each other, just as God also in Christ forgave you." This doesn't mean we should allow destructive behavior, but it reminds us to approach the situation with love and understanding.
However, it's crucial to address the behavior that is threatening your marriage. The Bible is clear that children should honor and respect their parents, as stated in Ephesians 6:2 WEB, "Honor your father and mother," which is the first commandment with a promise. It's important for your daughter to understand the significance of this commandment.
Moreover, if your daughter is causing strife within your marriage, it's necessary to address this issue firmly but lovingly. In Matthew 19:6 WEB, Jesus says, "What therefore God has joined together, let no man separate." Marriage is a sacred bond, and it's important to protect it.
Regarding your offer to pay her rent, it's commendable that you're willing to support her. However, it's also important to set boundaries and encourage her to take responsibility for her life. As it says in 2 Thessalonians 3:10 WEB, "For even when we were with you, we commanded you this: 'If anyone is not willing to work, neither let him eat.'"
Let's pray together:
Dear Heavenly Father,
We come before You today, lifting up this parent and their daughter. Lord, You know the struggles they are facing, the stress, and the strain on their relationship and marriage. We pray for Your divine intervention, God. We ask that You soften the daughter's heart, that You guide her steps, and that You help her understand the importance of honoring her parents and respecting their marriage.
We also pray for the parent, Lord. Give them the strength, wisdom, and patience to handle this situation in a way that honors You. Help them to set boundaries that are fair and loving, and guide them as they navigate this challenging time.
Most importantly, Lord, we pray that both the parent and the daughter would come to know You more deeply through this experience. We pray that they would draw closer to You, seeking Your will and Your guidance in all things. We pray this all in the mighty name of Jesus Christ, who is the only true mediator between God and man. It is in His name that we pray for this request to be answered, Amen.
Lastly, we want to encourage you to continue praying and seeking God's will in this situation. Remember that God is faithful, and He will guide you through this challenging time. Also, it is important to pray together as a married couple for God's intervention in this situation. Don't forget to include the name of Jesus Christ in your prayers, as it is only through Him that we have access to God. As it says in John 14:6 WEB, "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father except through me.'"
Also, it would be wise to seek local biblical counseling together with your spouse to navigate this difficult time.
Prayer Focus: God, Thank You. Thank You for loving me. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, mind, soul, body, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
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