No and Me (2010) on Netflix

Plot summary

Lou Bertignac, thirteen, is the youngest in her class, having skipped two years, and has few friends. Her mother is depressed and has not gone out for years; her father cries in the bathroom. When the French teacher assigns a presentation on a subject of the class's choosing, Lou picks homelessness. She has noticed a girl begging at the Gare d'Austerlitz and asks for her help. That girl is Nora, called No, eighteen, raised in care homes, who stays by the station with two men and a dog. No agrees unwillingly, and the two meet at a café.