Nora is a girl, born as one and ever one, there's no real confusion about it for her. Not that she doesn't get how weird it'd be to be in the wrong body but she isn't, and she knows how lucky that makes her. After all, most of those skirts Ren wears were hers once, at least until they start buying their own stuff.
She knows Ren isn't sure yet so she mostly avoids pronouns and uses their name over, and over, which she doesn't mind because Ren is a cool name.
When Ren starts correcting people, Nora dances gleefully around the computer lab, because maybe the teachers will stop being idiots about the pronouns thing. Maybe not immediately, because a lot of them are really old but eventually, hopefully, it will happen.