here are your possibilities:
a.)
she thinks you're cute and wants you to talk to her. (strap on a pair and do it! di pa ka ana.)
b.)
she thinks you look familiar, like she knows you from somewhere. (another reason to walk up and talk to her: "hi, aren't you friends with *insert random name here*")
c.)
you've got something on your face (food, dirt, a booger <ew.> etc.) Now, you can still use this to your advantage - laugh it off and it becomes a conversation starter. plus, she'll think it's cool that you're not too uptight to laugh at yourself. ok, it might not work if it were a booger cuz that's just too gross.)
d.)
she thinks you're absolutely hideous and regularly stops to stare at freaks of nature. (can't help u there. I suppose you could still start talking to her and impress her with your personality. good luck with that.)
i hope for your sake it's a.
Sitting Pretty in Cebu City