While locked in the basement, a part of the house notably inaccessible to Chloe due to the lack of a stairlift, the teenager notices a big envelope in the trash. This turns out to be a college acceptance letter from the University of Washington, which Diane had assured her had yet to arrive in the mail and which Chloe had been eagerly anticipating. Distraught at this latest irrefutable proof of Diane's betrayal, Chloe trashes the room and discovers a box labeled "Diane Baronway." With some difficulty, caused by having to abandon her wheelchair after discovering that it was chained to limit her mobility, Chloe opens the box to discover a picture of her running on her 4th birthday, proving she wasn't always disabled.
But that's not the most shocking discovery Chloe makes. She also finds a death certificate for someone named Chloe, with the age of death listed as 2 Hours 11 Minutes. She then discovers a newspaper clipping of a baby abduction at a hospital, and as she reads the story, the movie flashes back to Diane at the hospital shortly after giving birth. This time, the audience sees the baby in the incubator once again, but unlike the beginning of the movie, it doesn't end there, as it shows Diane holding the body of her dead child and crying. She is startled out of her thoughts by the nurses wheeling a new baby into the nursery, and as Diane stares at the new arrival, Chloe cries in the present, putting the pieces together.
This comes as a major shock both to Chloe and to the audience. Despite Diane's abuse of Chloe, the teen never had an inkling that Diane was anything other than her biological mother, let alone that she'd been abducted from the hospital at birth. Having seen Diane's baby in the incubator at the beginning of the film, audiences could've been forgiven for assuming Chloe, who seemingly suffered from numerous medical conditions, was the same child. This revelation, however, is crucial to showing Diane's true colors, as it strips away even the faintest possibility that Diane was abusing Chloe out of a misguided sense of love.
