Why did I feel some attraction to a girl?

I'm a 28 year old female, I've been straight my whole life. I've had boyfriend's and I've only ever been attracted to men. I still am. But there is this one girl, I literally met her once and she was working at a sketchers shop. We had a brief small conversation. But the way she looked and carried herself was just so beautiful I can't explain this feeling. I've never felt that way towards another female. Ever! She's been the only one and I think about that every once in a while.

Why did I feel some attraction to a girl?
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