Hindsight

Cas sees how depressed Dean is. He can't change the tragic past, but he can change who was there to witness it, and maybe that will change the future. This is how an ordinary girl winds up thrown into the world of Supernatural. She knows all the bad that's about to happen to the Winchesters, but can she stop it? Hindsight is 20/20, and Kelley sees all, even if she doesn't want to.