I don’t think she’s autistic. It has more to do with her upbringing. She kind of had to grow up sooner because of her dad’s position, everyone even her mother, kind of just expected her to responsible.
Her parents relied on her to be good and then because she was so responsible, the adults sort of separated her from other kids and dubbed her as practically the perfect daughter. The separation bled in with her peers and they all thought she was this poster child/senpai.
Everyone put her on a pedestal and she felt like she had to live up to their standards.
Anyway, in my head they reconciled with a kiss instead of a hug