What does it mean when a girl comes up to you and says hello, you respond and she giggles right after ?

Anonymous
Also when a girl asks "how are you" and you respond "fine, thank you" and she giggles and smiles and looks at you in the eye. Does this mean anything or is she just being friendly? (also I know I did not say "fine thank you" in a funny way so I know she did not giggle at the way I said it)
What does it mean when a girl comes up to you and says hello, you respond and she giggles right after ?
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