Does not surprise me at all.
I also don't imagine she has support beyond self-advocacy.
My experience is that Black people diagnosed on the autistic specrum are not remotely treated with the same credibility and empathy as Whites.
My family openly dismissed the autism spectrum as some made-up diagnosis for White people, that Black folks with mental health and-or congnitive challenges just needed to right with Jesus, he would take care of that.
I have frequently experienced professionals in mental healthcare (nearly always Whites) who cynically question the diagnosis, saying things like"you don't look autisitic" and presume Ineed a lecture on peronal responsibility, lift myself up by my bootstraps - while accepting, supporting, even defending Whites who diagnose themselves.