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You may not understand this now, but I am doing what I know is right for you. So, please, don't be scared. Don't cry. I'm not going to hurt you. This is gonna make you forget all of this. And when you wake up, I'll be right by your side. And you'll be my baby... forever.
~ Diane to Chloe after Chloe discovered her secret.
WE ARE GOING HOME!
~ Diane's last words in the movie.
Diane Sherman, née Diane Emerald Baronway, is the hidden main antagonist of the 2020 Netflix original film Run. She is a woman who kidnapped her "daughter" Chloe as a newborn following the death of her real baby and raised her as her own.
In the beginning of the film, Diane is shown her newborn daughter on a breathing tube following birth complications. The infant dies (not yet revealed to the audience) and the grief-stricken Diane becomes a villainess as she abducts another woman's baby from the maternity ward to raise as a replacement, naming her Chloe. By home schooling the child and keeping her drugged through pills, Diane raises the surrogate Chloe to believe she suffers from arrhythmia, hemochromatosis, asthma, diabetes, and paralysis that prevent her from meaningfully interacting with the outside world up to the age of 17.
As Chloe prepares to head for college, she grows suspicious after learning that her 'medication' prescription is under Diane's name instead of hers. Her worries are later increased when she discovers that the pills are in fact dog relaxants, the reason behind Chloe's apparent paralysis.
Diane grows fearful of Chloe's discoveries and attempts to gaslight her and those she seeks help from into believing that she is hallucinating due to the medication. After Chloe learns the whole truth after an interaction with the town pharmacist, Diane sedates her and chains her inside her bedroom. Using her ingenuity, Chloe is able to escape the house when Diane is absent, seeking help from local mailman Mike. Diane comes across them on the road and after following a tense confrontation, murders Mike and recaptures Chloe.
Chloe is chained to her wheelchair in the basement where she discovers her college acceptance letters as well as evidence of Diane's crimes, including photos of Chloe's real parents and videos showing that she is not truly paralyzed and can indeed walk. When the deranged Diane enters the room, Chloe attempts to commit suicide by drinking organophosphate, knowing that Diane will hospitalize her out of twisted affection.
Chloe is able to reveal Diane's true nature to the hospital staff only to be abducted by the villainess who begins transporting her towards the car to make her escape. Rushing to escape to the car, Diane pushes Chloe towards the exit but is stopped by stairs. Pulling out a gun, she panics and Chloe locks the chair so Diane can’t move her. After telling Chloe that she just wants to protect her, Chloe says she doesn’t need Diane as security guards arrive. Diane raises her gun only to be shot in the arm, causing her to fall down the stairs.
In an epilogue, the now able to walk Chloe arrives at the insane asylum where Diane resides, crippled and confined to her bed, unable to speak. The film ends with the reveal that Chloe is secretly drugging her false mother with the same medication that left her immobile.
Diane Sherman is obviously a deranged woman. Her lost of her own baby drove her to mental instability. Having kidnapped Chloe, she is overly possessive and controlling of her, even poisoning her to make sure Chloe would need her for the rest of her life. She is also delusional as she believes she does absolutely nothing wrong despite the obvious evidence of the contrary. However, she is intelligent and manipulative enough, being able to make Chloe dependent of her for seventeen years and successfully hiding the truth of the nature of Chloe's medication.