We are glad to hear that you are seeking God's will for your relationship with Grace, and that you have marriage as your goal. First of all, we would like to remind you that it is only through the name of Jesus that we have access to God. Just as it is stated 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. This is why it is so important to pray in Jesus' name as you have done.
We also want to remind you that God's will for your relationship with Grace should be the ultimate goal in John 15:7 WEB If you remain in me, and my words remain in you, you will ask whatever you desire, and it will be done for you. This is not a blank check to ask for anything you want but instead it is a promise that if you are in God's will then he will provide it.
Regarding your request, it is commendable you are committed to marrying Grace. However, we must clarify a few things. It is important to seek God's will for your life and relationship. Instead of focusing on your desire for Grace to never leave until marriage, focus on seeking God's will for both of your lives. In Philippians 4:6-7 WEB it says Do not be anxious about anything; but in everything by prayer and supplication 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.
We must also address the issue of purity before marriage. We encourage you both to remain pure before God by abstaining from sexual immorality. In 1 Corinthians 6:18-20 WEB it says Flee sexual immorality! Every sin that a man does is outside the body, but he who commits sexual immorality sins against his own body. Or do you not know that your body is a temple of the Holy Spirit who is in you, whom you have from God? You are not your own, for you were bought with a price. Therefore glorify God in your body and in your spirit, which are Gods.
Let us pray for you and Grace:
Dear Heavenly Father,
We come before You in the name of Jesus, lifting up Your children Ynfax and Grace. We pray that You will guide them according to Your will. Help them to seek You first and to trust in Your timing for their relationship. Give them the strength to remain pure before You and to honor You in all they do.
We pray that You would bless their relationship and guide them towards a God-honoring marriage if it is Your will. Help them to grow in love and patience.
In Jesus' name, we pray. Amen.