If a girl is constantly smiling at you, does that mean she's being nice or she likes me?

jasco
Me and a group of friends went to a jumping place where you can jump and everything on stuff. I met a girl, she challenge me and i beat her. I made her laugh lol, we just playing around and i ask for her number. She said she was taken so end of story i thought. turns out it wasn't cause for the entire time she was smiling at me everything we made eye contact. what does this mean?
If a girl is constantly smiling at you, does that mean she's being nice or she likes me?
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