I remember watching a small piece of a movie in which a girl is on a boat and she keeps on doing the same weird things. She then sees a note that she has written for herself and when she dies, she sees all the bodies of herself lying there. So that means she is doing the same things over and over again. the actress looks like, and maybe even is Amanda Seyfried. The movie is definitely horror movie.
Those are not the bodies of herself but of Sally played by Rachael Carpani.