Angel of Mine (2008)

Elsa Valentin (Catherine Frot) is in the middle of a brutal divorce and custody battle when she is struck by the appearance of a pretty young girl named Lola (Héloïse Cunin). Her interest in the child grows to an obsession, and she finds any possible excuse to be near her. When Lola's mother, Claire (Sandrine Bonnaire), grows unnerved by all this, Elsa admits she believes Lola is the daughter she thought she had lost in a hospital fire seven years ago, and wants to find a way to prove it.