Ben Croll Shortly before last year’s Cannes Film Festival, director Sophie Fillières attended a cast and crew screening of “Anatomy of a Fall.” The filmmaker had a supporting role in the film, playing the deceased’s sister, and she soon celebrated her work’s Palme d’Or win from afar, hanging back in Paris, where she was preparing to shoot her seventh feature, “This Life of Mine.” The five-week production kicked off in late June, running smoothly and wrapping on the last day of July. The next day, Fillières checked into the hospital; in less than a month, she was gone.