Why did she kiss me?

This morning I walked one of my friends who's a girl to first period before school started and when we went down the stairs I offered her my hand and she accepted. When we got to her class we hugged and said bye but before I could leave she grabbed my arm, turned me back around and kissed me on the lips. It was really nice, soft and smooth. I haven't been able to think about anything else, why did she kiss me? P. S. before you ask, yes I like her.
Why did she kiss me?
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