Does this mean she dropped out of high school?
Assuming she ever attended in the first place after middle school. It's not compulsory though it's extremely rare for someone to not go, but given her disability she might not have wanted to attend any more schooling than absolutely required.
Well she was wearing a two different types of school uniform in the flashback one of them was presumably for highschool so she probably went to highschool for a while at least. Or maybe she was just cosplaying. She definitely dropped out at some point and honestly can't blame her. Who needs highschool when you are a genius ero-mangaka.