She just wanted to have fun like every other young girl.
She went with the help of her fairy god mother.
She met her Prince Charming, and he was hooked at first sight.
She had to leave at the strike of midnight as instructed by her fairy god mother.
She willingly obeyed and ran and ooops! her glass shoe fell off, but obedience did not make her stop to turn to pick it.
But if she had turned to pick it, Prince Charming would have never located Cinderella, and they would have never been an EVER AFTER story.