"The Last Wish: The Secret Epilogue"

"Mom!" Johnny happily shouted as he hugged his newly recovered mother.
Yes, Johnny's mother was cured of her sickness because of Dianne's magic. Johnny was also sent back to school and was able to keep up with the lessons he missed. Everything turned out for the best... except for Dianne.
Dianne broke the rules of magic and was stripped off of her fairyhood. She was banished by the head fairy because of her actions.

At least she was able to do good for somebody before this happened.
She cured Johnny's mother and saved Johnny's education.

But... why did the clouds turn gray at the end of the story?
It's because the heavens cry for the poor fairy who really just did the best for her "person"...