Maybe she does know, but it could be the way she does things, or how she considers it to be an action where it come in line with 'being interested in Okazaki Tomoya'.
I haven't quite forgotten the scene with her thinking aloud about that in the previous episode.
I've heard about this 'sukeban' thingy and even read up on it. Ought to be interesting for her, and probably a good reason as to what she said in the preview (Switching schools).