My sister had a medical condition when she was 15/16. She prayed about it all the time, to god, Jesus and the universe to make sure she covered her bases. She was meant to have a surgery that would have changed her life forever (for the worse) but my step dad would not allow it. My sister kept praying. After seeing all kinds of specialists, including going to NYC to see the best, she had some tests and her condition was healed. The doctors called it a miracle (I doubt they were all religious so it was just a word to them) and had no logical explanation for her healing. The condition never returned.

Some things are not meant to be logically rationalized. Whether it was god or her own will that influenced the healing of her body we will never know in this human form. Her faith and belief in something bigger than herself cured her. That is the best explanation I have for it.