College classes just started back up again and I find myself

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College classes just started back up again and I find myself confused. Last semester there was a girl I was interested in with a lot in common w/ me including the same major. After making plans with her to go out sometime months ago she randomly texted me like 4 hours before and cancelled while giving me an excuse saying that something randomly came up. We sat together in the class we had before and I just stopped really giving her the time of day after she blew me off. I come to find out she's now in one of my classes this semester. I was late the first day and sat in a random seat that was open and she happened to be right next to me, w/o me noticing right away. The next day in order to avoid awkwardness I got there earlier and sat in a completely different area. She came in after me and proceeded to sit right beside me and started casually talking to me throughout the class like we used to before she blew me off months ago. Why would she do that? If she rejected me why would she randomly want to start talking again and choose to sit next to me on her own accord?