So there's this girl I know fairly well and I've been curious if she might be interested in me. She opens the door into a large lecture we have together and by change we make brief eye contact. She then takes an alternate turn from going to her usual seat and walks by me (on the complete other side of the room). I was being stubborn and was occupied with getting my materials out and did not look up again. She then walks out the other door of the lecture hall. I think to myself "what the hell is she doing?" After disappearing for 5 seconds, she immediately walks back through the door then finds a seat. My question is: did she want me to talk to her or was this just unusual? She is fairly shy.