Wikipedia says this
Quote:
In an interview in 1928, she explained that her desire for privacy began when she was a child, stating "as early as I can remember, I have wanted to be alone. I detest crowds, don't like many people."MGM eventually capitalized on it, for it bolstered the image of the silent and reclusive woman of mystery.
Here is a very interesting sourced article that goes in depth into the matter.
Garbo, Christina and AspergerAfter reading that article and seeing that Wikipedia quote think think it is quite plausible she was an Aspie.
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“Self Acceptance is a process not a performance”
“You are autistic enough. And you always have been”
Professionally Identified and joined WP August 26, 2013
DSM 5: Autism Spectrum Disorder, DSM IV: Aspergers Moderate Severity.