Where she went is the prequel to If I stay book. It discussed the story of Mia and he ex, who now has another girlfriend. They both met up in New York city and found each other. They find themselves reminiscing about the past and then created plans for the future. The remainder of the plot was taken from Wikipedia
If I Stay is a young adult novel by Gayle Forman published in 2009. The story follows 17-year-old Mia Hall as she deals with the aftermath of a catastrophic car accident involving her family. In acoma, Mia has an out-of-body experience, and watches as friends and family gather at the hospital where she is being treated. Mia watches as her memories flash before her eyes as she comes to realize that she must decide if she should wake up and lead a life far more difficult than she ever anticipated, or slip away and die.The if I stay etext has received positive reviews. A sequel hit shelves in April 2011, entitled Where She Went.