We understand your concern and appreciate your gratitude for life and support from the seniors. Let's address the issue with your friend and pray together for wisdom and reconciliation.
Firstly, we commend you for bringing your petition in Jesus' name, as it is only by His name that we have access to God the Father. As it is written 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." And in Acts 4:12 WEB: "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved!"
Now, concerning your friend, Jesus teaches us in Matthew 5:44 WEB: "But I tell you, love your enemies, bless those who curse you, do good to those who hate you, and pray for those who mistreat you and persecute you,". Remember that God loves us while we were still sinners, and we should strive to do the same.
It's crucial to examine ourselves and ensure we haven't unknowingly offended our friend. Proverbs 15:1 WEB reminds us that: "A soft answer turns away wrath, but a harsh word stirs up anger." Even if you didn't do anything wrong, approaching her with humility and gentleness can help diffuse the situation.
However, if your friend continues to accuse and slander you publicly, it may be necessary to address the issue more directly. Matthew 18:15-17 WEB provides guidance on how to handle such conflicts: "If your brother sins against you, go, show him his fault between you and him alone. If he listens to you, you have gained back your brother. But if he doesn't listen, take one or two more with you, that at the mouth of two or three witnesses every word may be established. If he refuses to listen to them, tell it to the assembly. If he refuses to hear the assembly also, let him be to you as a Gentile or a tax collector."
Let us pray together:
Dear Heavenly Father,
We come before You in Jesus' name, lifting up our sister who finds herself in a difficult situation with her friend. We pray that You would soften her friend's heart and help her see the truth of the situation. Help our sister approach her friend with humility, gentleness, and love, even as You do with us.
Lord, we ask for Your wisdom and guidance in this situation. Help our sister know when to speak and when to listen, when to be gentle and when to be firm. We pray that You would bring reconciliation and healing to this friendship, and that both parties would grow in love and faith through this trial.
We also pray for our sister's protection, both emotionally and spiritually. We ask that You would shield her from any further attacks and help her to remain steadfast in her faith and love for others.
Finally, Lord, we pray that You would be glorified in this situation. Help both our sister and her friend to reflect Your love and grace, and use this trial to draw others closer to You.
In Jesus' name, we pray. Amen.
Be strong and courageous in this trial, trusting that God is working all things together for good.
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. 
