Whatever happened to Sylvia Sykes?

Intro:
She was the belle of the ball. Her parents adored her, teachers admired her and her friends loved her. She was the role model. Everybody wanted their kids to be just like her!
But that summer, something happened, which changed everything. This girl who came back, senior year, is not the Sylvia everybody new. The Sylvia they knew was never so mean and inconsiderate. Her ever smiling face was now blank and void of all emotions and expressions. Her once warm heart was now stone cold and was wrapped in a cocoon.
Kyle Jacobs has always been in awe of Sylvia. He had always adored her, loved her, with all his heart, but could never really tell her because for her, he was a good friend. He did not want to ruin that friendship too. When she returns to school after that summer , he could not take it ;looking at her in that state only brought him pain and so he decides to save her and find out what killed the real her.