My Friend from the Park (2015)

With her husband away Liz (Julieta Zylberberg) has left her job to care for their infant son, Nicanor (Andrés Milicich). Feeling lost and alone, she begins taking him to the neighborhood park where she befriends the blunt, spontaneous Rosa (Ana Katz). From a dine-and-dash meal to sharing fears about motherhood, Liz feels an immediate, liberating bond. That freedom soon turns into paranoia, however, as she begins to suspect Rosa's true intentions.