* The Story's Focus: The Cinderella story typically focuses on her childhood and young adulthood, specifically the time leading up to and including the ball. We don't get a lot of information about what happens to her after that.
* Different Versions: There are many versions of the Cinderella story, each with its own ending. In some versions, Cinderella and the prince live happily ever after. In others, her happiness is more nuanced, or she faces additional challenges.
So, what happened to Cinderella after twelve? It depends on which version you're thinking of!
Do you have a specific version in mind? If you do, I might be able to tell you more about what happens to Cinderella after twelve.