Why did this girl start paying a lot of attention to me after she rejected me?

Anonymous
I don't get this. I pursued a girl for awhile, and she was definitely interested at first, so we ate lunch together. It was clear that there were some differences between us, but I still felt a connection, so I asked her out again. She said she'd think about it; a week later, she flat-out said she wasn't interested, so I stopped approaching her.

Well, in the 3 weeks since then, I've seen quite a change in her behavior. She is now going out of her way to converse with me every time she sees me (she never initiated conversation beforehand) and she always has a big smile on her face. If she's sitting on the other side of the room, she'll steal glances at me. When I'm in class, I can feel her staring at me. She won't talk to me when I'm talking to other girls, though--but as soon as they're gone, she'll approach me again.

I don't get this. Why does she seem 10x as interested in me after rejecting me? I'm not even that into her anymore.
Why did this girl start paying a lot of attention to me after she rejected me?
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