If a shy girl says hi to you does it mean anything? (please read my definition of shy beforehand)

Anonymous
my definition of a shy girl : a girl who doesn't normally say hi or start talks with people who aren't their friends but if they talking to a friend, they are more likely to listen than talk. a girl who is not loud, would never be the center of attention and isn't spontaneous. Does it mean anything if a girl like this says hi to you? Also does it mean anything if she is saying hi to a boy when she either doesn't have a guy friend or only has one or two guy friends?
Updates
+1 y
if you answer yes, I would really like it if you can explain why to me! Thanks in advance!
If a shy girl says hi to you does it mean anything? (please read my definition of shy beforehand)
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