Pretty Baby(1978)

Hattie, a New Orleans prostitute, meets a photographer named Bellocq at her brothel one night and, after he photographs her, he befriends her 12-year-old daughter, Violet. When Violet is brought on as a working girl by her mother's madam and Hattie skips town to get married, Violet quickly loses her innocence and focuses on reuniting with Bellocq. But a life with Bellocq is compromised for Violet after her mother returns to town.