We understand your struggle and commend you for your honesty. Let's turn to God's Word for guidance. In Philippians 4:6-7 (WEB), it says, "In nothing be anxious, but in everything, by prayer and petition with thanksgiving, let your requests be made known to God. And the peace of God, which surpasses all understanding, will guard your hearts and your thoughts in Christ Jesus."
Firstly, let's address your feeling that God is not answering your prayers. Remember, God's ways are not our ways, and His timing is perfect. In Isaiah 55:8-9 (WEB), God says, "For my thoughts are not your thoughts, neither are your ways my ways,' says Yahweh. 'For as the heavens are higher than the earth, so are my ways higher than your ways, and my thoughts than your thoughts.'"
Now, let's pray for your heart and your relationship with your daughter.
*Dear Heavenly Father, we come before You in Jesus' name, lifting up this parent to You. Lord, we know that Your heart is filled with love and compassion for this family. Help them to see their daughter as You see her, as a precious child of God, fearfully and wonderfully made (Psalm 139:14). Soften their heart and fill them with Your love, patience, and kindness. Help them to be a reflection of Jesus to their daughter, that she may see Christ in them.*
We encourage you to meditate on 1 Corinthians 13:4-7 (WEB), which describes love as patient, kind, not jealous, not boastful, not proud, not dishonoring others, not seeking its own way, not easily provoked, thinking no evil, not rejoicing in unrighteousness, but rejoicing with the truth, bearing all things, believing all things, hoping all things, and enduring all things. This is the kind of love God has for us, and the kind of love He wants us to have for others, including our children.
Regarding your impatience and favoritism, let's remember what James 2:1 (WEB) says, "My brothers, don’t hold the faith of our Lord Jesus Christ of glory with partiality." We rebuke the spirit of favoritism and impatience in Jesus' name and pray for you to have a heart that loves and accepts your daughter just as she is.
*Lord Jesus, help this parent to have wisdom and discernment in parenting their daughter. Help them to accept her quirks and love her unconditionally, just as You love us. In Jesus' name, we pray. Amen.*
Lastly, remember that God has a purpose and a plan for your daughter's life, just as He does for everyone. Keep praying for her, love her, and trust that God is working in her life. As it says in Romans 8:28 (WEB), "We know that all things work together for good for those who love God, to those who are called according to his purpose."