You go and pray for her, just like Jesus told His apostles to do. You are the representative of Jesus here on earth now. If you were Jesus, what would that look like???? You are Jesus as a believer, He lives in you, the Father lives in you, the Holy Spirit lives in you, just like Jesus. The only thing that prevents you from seeing yourself as another Jesus here on earth is your mind, and "you" are supposed to be renewing your mind to the Word of God. The Word of God tells believers to "heal the sick, cleanse, the lepers, raise the dead, and cast out devils".
Are you willing to try to be like Jesus?
Jesus said His people could have what they say, but instead,they say what they have.
Matthew 17:20
He replied, "Because you have so little faith. Truly I tell you, if you have faith as small as a mustard seed, you can say to this mountain, 'Move from here to there,' and it will move. Nothing will be impossible for you.
Speak to the problem, it is speaking to you already.
Jesus never said to "pray for the sick". Jesus said to heal the sick.
Matthew 10:8Living Bible (TLB)
8 Heal the sick, raise the dead, cure the lepers, and cast out demons. Give as freely as you have received!
John 14:12-14Living Bible (TLB)
12-13 “In solemn truth I tell you, anyone believing in me shall do(this could be a command?) the same miracles I have done, and even greater ones, because I am going to be with the Father.
Mark 16:17-18King James Version (KJV)
17 And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues;
18 They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall (this could be a command?) lay hands on the sick, and they shall recover.
Speak to your problem. Like this prayer;
In the name of Jesus, I command the pain in my leg to leave my body, now. My leg is now healthy, well, healed, and whole. Thank you Jesus.
Here is a good teaching on how God wants you well, and how to get it.
http://www.awmi.net/audio/audio-teachings/#/awm_1036a_atonement.mp3
In the name of Jesus, be blessed.