I think it's pretty wild how closely the movie sticks to the real investigative journalism stunt that made Nellie Bly famous in 1887. She was a reporter for Joseph Pulitzer's New York World, and she pretended to be insane to get herself committed to the Blackwell's Island Women's Lunatic Asylum. Her goal was to expose the horrific conditions from the inside.
The show definitely dramatizes things for TV, but the core facts are there—the inhumane treatments like ice baths, the rotten food, the staff brutality, and how easily 'sane' women could be trapped there. After ten days, her newspaper got her released, and her published articles, later the book 'Ten Days in a Mad-House', caused a huge public outcry. That part always gets me; her work directly led to a grand jury investigation and increased funding for mental health care. It's one of those stories that reminds you how dangerous and necessary real reporting can be.
I sometimes wonder if they'll ever make something that digs even deeper into her later life, like her trip around the world.