Jesus said:
John 14:12King James Version (KJV)
12 Verily, verily, I say unto you, He that believeth on me, the works that I do shall he do also; and greater works than these shall he do; because I go unto my Father.
Peter believed what Jesus said and did it.
Acts 3:6-16King James Version (KJV)
6 Then Peter said, Silver and gold have I none; but such as I have give I thee: In the name of Jesus Christ of Nazareth rise up and walk.
7 And he took him by the right hand, and lifted him up: and immediately his feet and ankle bones received strength.
8 And he leaping up stood, and walked, and entered with them into the temple, walking, and leaping, and praising God.
You are able to walk through this life like Peter and Jesus, laying hands on the sick, and speaking healing into the bodies of people. You do not need to "see" anything happen immediately. Your responsibility is to speak healing and lay hands on sick people. Meet with your mentor and ask her if you could pray for healing for her shoulder. When she consents speak aloud the following prayer while laying a hand on her shoulder.
In the name of Jesus, I speak life, health, healing, and wholeness into this shoulder, now. Shoulder, be healed, now, in the name of Jesus. Thank you Jesus.