That's incorrect. She suffered with OCD.
Obsessive–compulsive disorder (OCD) is a mental disorder and knocking is considered a "compulsion". A mental disorder is also called a mental illness or psychiatric disorder.
OCD knocking is performed to relieve anxiety and is common among sufferers. It's usually combined with repetitive thoughts of numbers, patterns, and magical thinking (i.e. "signs" and predictive attributes). This was the crux of the film.
She was likely prone to the disorder since mental illness was in her genetic, paternal background. In real-life, she would've had a an extremely difficult time obtaining home-study approval in order to adopt or foster the female student, due to her long-term OCD and her terribly inconsistent background (job, education, relationships, etc.).
As the filmmaker portrayed, she was mentally and emotionally stunted due to her illness.
Many people with this character's problem were profiled on A&E's "Obsessed" which is currently available on Netflix.
"Don't get chumpatized!" - The King of Kong: A Fistful of Quarters (2007)
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