Angst? What Angst?: Even before Chloe discovers Diane's many lies, she seems remarkably well adjusted for having been basically a shut-in with seemingly almost no human interaction besides Diane for her entire life. For example, she has almost no trouble interacting with strangers or navigating the outside world, apart from the logistics of being in a wheelchair.
Catharsis Factor: Chloe telling Diane to "open wide" when visiting her in prison can be seen as this.
Esoteric Happy Ending: Chloe escapes Diane and 7 years later has met her true birth parents, married, had a child, regained some of her mobility, and started a career making prosthetic limbs for children. However, when she visits Diane in prison, it’s revealed she’s been sneaking in and force-feeding the same drugs to Diane. While this can be seen as Laser-Guided Karma and Catharsis Factor seeing Diane get the treatment she inflicted on a child, it does reflect negatively on Chloe’s mental state being unable to move on from the horror Diane put her through. And while it’s definitely not a case of She Who Fights Monsters, she still has a darkness in her bestowed by Diane that she can never truly escape. There's also the fact that Tom, the postal worker who tried to rescue Chloe only to be stopped by Diane, is probably dead.
Spiritual Successor: The whole story can be a loose remake of the Stephen King story Misery as they are both about wheelchair bound protagonists who are stuck with an overly protective woman who is obsessed with their lives.
Funny Moments: When Chloe cuts the line in the clinic, she casually says "I'm paralyzed. Feel bad for me."
Moral Event Horizon: Diane crossed it either by stealing a baby from the hospital, making Chloe sick on purpose via pills for dogs while lying about her condition, or by possibly murdering Tom the postal worker.
Tom as well. He wanted to genuinely help Chloe and didn't get ensnared in Diane's lies. And how does he get repaid for his efforts? A sedation needle to the neck and possible death, keyword is 'possible'.
