Let us begin by thanking God for the precious life of your granddaughter and for the love and dedication you have shown in raising her. It is evident that you have invested much time and effort in nurturing her and teaching her the ways of the Lord.
Firstly, let us address the concern that the prayer does not mention Jesus Christ, Jesus, or Christ or an abbreviation such as IJN (In Jesus Name). We are not in heaven yet. The only way to God is through Jesus. "Jesus said to him, I am the way, the truth, and the life. No one comes to the Father, except through me." John 14:6 WEB It is only by the name of Jesus that we have access to God. Also, there is no other name by which we can be saved. "in none other is there salvation, for neither is there any other name under heaven, that is given among men, by which we must be saved!" Acts 4:12 WEB
We understand your heartache and concern for your granddaughter's behavior and her struggle with respect and disrespect. School attendance and grades are very important. Rest assured, God hears your prayers and knows your heart. As it is written, "Therefore I tell you, do not be anxious about your life, what you will eat, or what you will drink; nor yet about your body, what you will put on. Is not life more than food, and the body more than clothing?" Matthew 6:25 WEB God wants us to trust him with our children.
It is crucial to remember that children are a heritage from the Lord, and He entrusts them to us to raise in His ways. "Behold, children are a heritage of Yahweh. The fruit of the womb is his reward." Psalm 127:3 WEB
As your granddaughter navigates through her teenage years, it is important to continue teaching her the importance of honoring and obeying authority, as the Bible instructs, "Children, obey your parents in the Lord, for this is right. Honor your father and mother, which is the first commandment with a promise," Ephesians 6:1-2 WEB
It is essential to address the issue of disrespect and disobedience promptly and firmly, as the Bible teaches, "Foolishness is bound up in the heart of a child; The rod of discipline drives it far from him." Proverbs 22:15 WEB
Remember to rely not on your own strength, but allow God's grace to empower you. Do not allow her bad behavior to be confused with allowing her to decide her own way rather than teaching her the right way.
Let us pray together:
Dear Heavenly Father,
We come before You today, lifting up our sister and her granddaughter. We thank You for the love and dedication shown in raising this precious child. Lord, we ask that You would soften her granddaughter's heart, that she may once again be respectful and obedient, honoring her grandmother and the authority placed over her.
We pray that she will live for Jesus and not for herself. We pray that you will bring her to repentance. "For you were once darkness, but are now light in the Lord. Walk as children of light," Ephesians 5:8 WEB
We ask that You would grant our sister wisdom and strength as she continues to guide her granddaughter in the ways of the Lord, and “Bring them up in the discipline and instruction of the Lord.” Ephesians 6:4 WEB
We pray your Holy Spirit will speak to her about Jesus. We pray she will read the Bible and believe in Jesus Christ who is the only way to come to God.
In Jesus' name, we pray believing. Amen.
Be encouraged. You have done well to invest in your granddaughter with godly values.
Let's lift up our fellow members in prayer! 
@RobertPearson’s friend needs fellowship and protection.
Protection and peace for those facing spiritual attacks and harassment.
Good health and employment for those in need.
Blessings for @RobertPearson's friend seeking fellowship and protection.
Strength and guidance for those seeking personal growth and healing.
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