Do you want to date her or just be friends? I can't say for certain whether this would come across as too bold (I'm female and have never been in a relationship) but you might just go up to her and ask if she wants to go for coffee sometime, or perhaps to an upcoming school dance if you enjoy those sorts of things. If you'd rather, tell her you and a group of friends are getting together to do X and ask if she wants to come. The next time you have a group project, see if she wants to be partners, or just find her in the cafeteria and ask if you can sit by her. There are plenty of pretexts by which to get together with someone you like, you just have to keep an eye out for the opportunities as they present themselves.
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"Survival is insufficient" - Seven of Nine
Diagnosed with ASD level 1 on the 10th of April, 2014
Rediagnosed with ASD level 2 on the 4th of May, 2019
Thanks to Olympiadis for my fantastic avatar!