On IMDB under the Trivia heading for this film, it says:
In the last scene, the girl in the train who looks up and smiles at Sara is the "real life-Sara". Her name is Tabita, and the director got the inspiration for the film from reading her story in a national Danish newspaper in 2006.
http://www.imdb.com/title/tt1065318/trivia?tab=tr&item=tr0663798
I can't confirm if that is true but it refers to this scene: