Why did she acted like this?

At a girls sporting event at my school , I was sitting on the middle section of the bleachers and my schools team was on the lower side of the bleachers then I heard someone whispering my name and I looked and it was one of the girl athletes that I’m kinda friends with and she goes hi with a big smile and waved to me infront of everyone on our section of the bleachers
Why did she acted like this?
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