Have you read the book by Ben Curson's, Gifted hands, anyway He would only operate on the people God allowed Him to operate on. That's why HE was known as the most gifted doctor. But now it has come a time that He has a tumor on His head and He needs to be operated on else He will die. You can Just imagine How now He is going to have to trust another surgeon and believe God has qualified that surgeon. I believe Doctors are sent of God, we do not have to go looking for them, they like angels they come into our lives when we need them to do the task God has assigned and anointed them to do, If Ben Curson had never told us how He used to operate in His book, I believe many people coming to Him for operations would have thought this man is rather strange, because HE talks to God in the operating room or something like that and they would have opted for a different surgeon. Tell your mum, that God has sent that doctor to he and she should trust Him/her but most importantly trust God would only send her the BEST doctor, perhaps not as qualified in the eyes of man, but approved and ordained by God and that even before this day came, God knew about it (psalm 139:16)