The title She Dies Tomorrow refers to a line spoken by the film’s lead character Amy (Kate Lyn Sheil) to her sister Jane (Jane Adams) early on in the movie.  Jane shrugs it off, but then slowly becomes obsessed by the possibility that she too could die tomorrow.  She goes to a birthday party where she passes on her distressed theory to a group of four (Chris Messina, Katie Aselton, Jennifer Kim, and Tunde Adebimpe),…