She likes you? If you got her laughing then I think she likes you.
But, no, not just autistic people don't look you in the eye.
Most shy people, some very quiet people, some people with low-self-confidence don't look others in the eyes.
Neither do some people who have a crush on someone look them in the eye, as well as most people who feel embarrassed, intimidated or scared.
That's why eye-contact is hard often actually, if you don't do this naturally. It all depends on circumstances whether one looks the other in the eye, how the others responds to it with their gaze and for how long each person will attempt to keep eye-contact, how long they'll look elsewhere and so on. Everyone's different too.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett