Is there any movies about a woman kidnapping a boy?

Yes, one notable film that features a woman kidnapping a boy is "Room" (2015), where a young mother and her son are held captive in a small room for years. The story explores their escape and the challenges they face as they reintegrate into society. Another example is "The Good Son" (1993), which, while primarily focused on a boy's relationship with a disturbed cousin, includes themes of manipulation and danger involving children.