If a girl keeps looking up and down at me and smiling a lot, what does it mean?

Anonymous
So this girl I had seen around but never talked to came up to me and started talking. SHe was friendly so I kept talking to her, she kept smiling and looking into my eyes, laughing at all my jokes and I noticed she kept looking at my face then down my body and up again, she did this a few times. We talked for a good while and I've seen her around but she seemed like the quiet type, but yesterday she kept making conversation. Was she just being friendly?
If a girl keeps looking up and down at me and smiling a lot, what does it mean?
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