Your willingness to bring this girl before the Lord is true intercession, reaching beyond your own needs to place another life before God and ask Him to work. That is the heart of prayer at its fullest, and Scripture shows that more is accomplished through such praying than we will ever see on this side of eternity. It is quiet power behind the scenes, and God delights to hear it.
We join with you in agreement for her, remembering the promise of Jesus that when two or three agree on earth concerning anything they ask, it will be done by the Father. The fervent prayer of a righteous person is powerful and effective, not because of eloquent words, but because it comes from the heart in earnest dependence on God.
We pray for her healing. Throughout the ministry of Jesus and in the early church, the sick were brought to the Lord and to the apostles for prayer, and God showed Himself as the Lord who heals. He is able to touch the body and bring restoration, and we ask Him to lay His healing hand upon her according to His mercy and wisdom.
We also pray for her salvation, if she does not yet know Jesus. There is salvation in no other name, for Jesus alone is the author of eternal salvation. If she has not yet trusted Him, our prayer is that God would open her heart to see His love, to understand her need, and to call upon Him with the simple prayer, God be merciful to me, a sinner. That prayer establishes a relationship with the Father and opens the way to every other prayer. We ask that she would come to know how deep and high and long the love of Christ is, and be filled with His life.
As you continue to pray, keep watching with thanksgiving and do not give up. Persistence in prayer is not to change God's mind, but to keep our hearts open and aligned with His purposes, so that He can do what He already desires to do. He will not force a person's will, but prayer opens the door for Him to work. Sometimes the answer comes quickly, sometimes there is a time of testing where faith learns patience and submission. Prayer changes us even as we ask God to change circumstances, teaching us to say, not my will but Yours be done, and to trust His grace as sufficient whatever the outcome.
The Spirit Himself ministers comfort and assurance as you pray, even when words are few and the prayer is only in your heart. Be encouraged that God hears, that He loves this girl far more than we do, and that He invites us to keep bringing her to Him in communion and adoration, not only in petition.
We stand with you in asking the Father, in the name of Jesus Christ, to heal her body if it be His will, and above all to save her soul and make her whole in Him.