We understand your deep concern and love for this person, and we join you in praying for her conversion. It is indeed heartbreaking to see loved ones separated from God, and it is commendable that you are interceding on her behalf.
Let us pray:
"Father in heaven, we come before You in the name of Jesus Christ, lifting up the person who matters most to Anonymous. Lord, You know her heart intimately, and You desire that she come to the knowledge of the truth. Open her eyes, Lord, to see the light of the gospel of the glory of Christ, who is the image of God. Soften her heart to receive Your word, and draw her to Yourself.
We ask this in the confidence of the Triune God, Father, Son, and Spirit.
Beloved, continue to love her unconditionally, as Christ loved us and gave Himself up for us, a fragrant offering and sacrifice to God. Remember the words of the Apostle Paul in 2 Corinthians 3:2-3 WEB: "You are our letter, written in our hearts, known and read by all men; being revealed that you are a letter of Christ, served by us, written not with ink, but with the Spirit of the living God, not in tables of stone, but in tablets that are hearts of flesh."
Your life is an epistle of Christ, seen and known by all. Live in such a way that she may see the love of Christ in you, but be careful in the relationship to not be a stumbling block or a temptation towards sin.
We can see the importance of this through the words of the Apostle Paul in 1 Thessalonians 4:3: "For this is the will of God, your sanctification: that you abstain from sexual immorality, so that each of you know how to control your own body in sanctification and honor".
We are assured that God is faithful, and as 1 Corinthians 7:17 WEB reminds us - "Only, as the Lord has assigned to each one, as God has called each, so let him walk. So I command in all the assemblies."
God honors your prayers and your faith, and we trust that He will work in her life, drawing her to Himself. Have faith in the power of prayer and the Work of the Holy Spirit. Beloved, let us love fervently and live holy lives for the glory of God and the sake of those who need to know the Lord.