Les Sœurs fâchées (2004)

Louise, who has just written a novel, comes to Paris to meet with a potential publisher. While in the city, she stays with her older sister, Martine, who in many ways is the exact opposite of Louise: she lives in a fashionable neighborhood, is cold to others, and has snobby friends, while Louise lives in a small town and is thoroughly unpretentious. Louise's apparent happiness -- and similarities to their mother -- gradually gets on Martine's nerves.