What does this girl's behavior mean?

As I pass by the girl I'm talking about in the hallway, she has an excited face, smiles, and I feel that she is having a hard time holding back. There was an event last month, I gave this girl a chair, but I didn't realize it was her. I looked at that she and she recognized me immediately. If you could see how excited she was. The environment was not conducive so I did not speak. There was such a thing as a little fun. I had to stand up every once in a while, she was staring at me. I didn't wait for the fun to end so I left. I wish I had waited? Now she's graduated, she's gone. But she's most likely going to graduate school. I have one more year. We'll probably meet at school.

What does this girl's behavior mean?
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