TVD/TO Secret Revealed

After fighting with Damon for felt like the thousandth time Elena decided to go for a few drinks to forget the anger and resentment, Elena knew why she is feeling like this because she found out a secret that was hidden for nearly eighteen years, she wasn't drinking alone though and after a few more she slept with him.
What if Elena was a werewolf and no-one knew that because she kept it secret? What if there was one person who knew?
Elena is not a vampire in this story.