Hmmm ....
I say take it slow. She's in your class, she isn't going to disappear anytime soon. Do little things like suggest coffee after class, and see if she seems to want to do that. See what happens if you allow yourself time to get comfortable with her, and to know her, in a graduated and comfortable manner that is never pushy.
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).