Hi & welcome
It could be that she finds you interesting, or that she is interested in seeing how you behave around her, since she knows that you like her.
After all, if there was a girl who liked you, and someone told you about her, wouldn't you glance at her, to see what she was like ~ even if you weren't attracted to her?
It sounds as if she doesn't mind being friendly with you, but that, at present, anyway, she does not want anything romantic from the friendship ~ and wants to be sure that you realise this.
I actually think that this is quite fair. It's better than leading boys on, I think.
There are lots of boys and girls who are in a similar situation to you ~ liking someone romantically, who is only interested in being friendly. There are probably quite a few in your classes.
But, in time, you will find someone who you like and who likes you back.
Good luck:)
