She rejected me and now she's being weird...

Im M16 and she is F16. She basically rejected me last year and then when the new schoolyear came around at first she would look at me and that was obviously because she remembers me from shooting my shot. Then for 6 months into the schoolyear there was nothing, no eye contact, and i was starting to forget about her and move on. And whenever we make eye contact i always doubt that she was intentionally looking at me. But this time im confident in saying that she was definitly looking for me, and looking at me. So after a long time, all of a sudden she starts trying to make eye contact with me. And im also pretty sure she tried bumping into me aswell. Might even be more than once but there is one time, this happened yesterday, where im pretty sure she tried to. Because i saw her, and ofcourse i see her as the girl who rejected me so i tried to just walk past her with a little distance. And all of a sudden that distance got smaller and smaller, and i thought i saw her actually try to bump into me but fail. As in taking a step to her right instead of the direction she was going. I dont get what she's trying to do? And if she's just bored or actually interested, though i doubt that. But im just curious in what she's trying to do with this. And what you would advice me to do right now?

tl;dr: She rejected me last year, now tries to seek eye contact and possibly bump into me. She's being weird and im really wondering why that is? And looking for advice as to how to act and respond to this?