Perhaps controversial, but I can fully believe Josie is not autistic. She doesn't seem to have issues with socialization, empathy, or other classic autism traits. She is introverted, has childish tendencies, and probably hyperactive (her stim toys). She can have autism traits without hitting enough of them for an official diagnosis.
There's also been hints at a poor or possibly unsafe childhood (being unable to afford haircuts, her self soothing behaviors when Damiel yelled, etc) which could account for her childish behaviors, introversion, and some of the stimming (if it was for comfort or anxiety rather than a compulsion).
TL;DR: Asian autistic queen is not Asian and possibly not autistic