I Always Wanted to Be a Saint 2003 on netflix

A teenage girl, Norah (Marie Kremer), living with her depressed father, Jean-Michel (Thierry Lefevre), in Luxembourg, obsesses over the whereabouts of her missing mother, who left them both when Norah was still a newborn. Norah is a misfit and devotes her energy to helping others and conversing with an imaginary friend. But, when she receives information pertaining to the possible location of her mother, Norah has to seriously think about inviting the woman back into her life.