Except God didn’t make her deaf, nor wants her to remain deaf.
Jesus never once told someone who asked for healing, sorry, The Father wants you sick...
I know Andrew Wommack ministry has seen quite a few deaf people healed, you might contact them about visiting them or one of their satellite Bible colleges in other states other than Colorado, so she can get prayed for.
Blessings.
You are quite correct. God never teaches us anything through sickness. Sickness originates from the devil, who manipulated Eve who in turn got Adam to disobey God, thereby bringing sin, sickness, disease, and death into the world.
This is not to say that all sickness is the result of demonic possession, although Jesus did cast out a deaf and dumb spirit, cured an epileptic by casting out the demon, and straighten up a woman who He recognised as being oppressed by the devil for the previous 18 years. But other sicknesses are medical issues because our bodies are mortal and are wearing out, and can be dealt with by medical intervention.
It is interesting that John Wimber prayed for sick people for 11 years without much result, then suddenly people started getting healed. He asked the Lord why it took so long and the Lord replied, "I wanted to be sure you meant business with Me."
Smith Wigglesworth often spent all night with a sick person, praying without ceasing until the person was healed. Other times it was immediate like the time he was on a streetcar and he saw a man lying on the footpath in agony. He jumped off the streetcar, prayed for him, the man was instantly healed and ran off, and Wigglesworth got back on the streetcar to resume his journey.
Guy Bevington, the early 20th Century Methodist Holiness healing evangelist, would fast and pray for days, even weeks on end until he got a vision of the person being healed, and then he knew that God was going to heal that person. One such person was instantly healed of advanced tuberculosis that way.
The healing evangelists and others who usually fail to get results are those who are wanting to enhance their own reputations in some way. God puts them to the test to see how long they will pray for sick people in obedience to Him without results, so that when they come to the end of themselves and just cry out to God from the depth of their hearts because they have deep compassion for the sick, then the Lord knows that they will give all the glory to Him, because He won't share His glory with those who want to take their share of His glory. It is possible that ambitious people will try to rob God of His glory and use the results to get the praise of men, when it should be God who gets all the praise.