Marie Laveau was a woman who practiced voodoo in New Orleans. She was born in 1801 and died when she was 80 years old. She was never a slave because she was born free. Few people know that Marie Laveau had a daughter with the same name. Many people flock to her grave to light a candle and pay respect.
Ruby describes her uncle's mental health facility as being 20 miles outside of the city. Though it is not so far out of New Orleans, one possibility might be the River Oaks Hospital. The hospital works with adolescents and adults and works with issues such as OCD and addiction.