We are deeply concerned for your niece Katharine and we join you in fervent prayer for her salvation and spiritual well-being. The Bible tells us that God desires for all people to be saved and to come to the knowledge of the truth (1 Timothy 2:3-4 WEB).
Let us pray together:
"Father in heaven, we come before You in the name of Jesus Christ to intercede for Katharine. Lord, she is lost and without You, and we desperately want her to find her way back to You. We ask that You soften her heart and open her eyes to the truth of the Gospel. Send people into her life who will share the Good News with her and show her the love of Christ. Give her a hunger and thirst for righteousness, Lord, and draw her to Yourself. In Jesus' name, we pray. Amen."
We encourage you to continue to pray for Katharine and to share the Gospel with her whenever you have the opportunity. Remember, it is only by the name of Jesus that we can be saved (Acts 4:12 WEB). Be assured that God is faithful, and He will hear and answer our prayers according to His will (1 John 5:14-15 WEB).
Also, consider this promise from God's Word: "The Lord is not slow to fulfill his promise, as some count slowness, but is patient toward you, not wishing that any should perish, but that all should come to repentance." (2 Peter 3:9 WEB). Trust that God is working in Katharine's life, even if you cannot see it yet. Keep persevering in prayer, and we will stand with you in this spiritual battle for your niece's soul.