Rosa is a young woman who is a follower of Darius Enright's self-help movement.
She learns that Juliette is in the early stages of her second pregnancy and reveals that the Movement is keeping her own son captive from her. However, she ultimately helps Juliette to escape.
She also manages to escape with her son and shows up at Juliette's house. Juliette demands action against Darius and the Movement over what has happened.