Welcome Blinding!I saw her and I would've said Taurus or Virgo. She looks earthy. She reminds me most of all of a friend from HS who had a Taurus Sun/Virgo Moon.
You should say 'hi' and strike up a conversation. Most girls are at least a little interested in astrology so you could ask her directly. Or you could add her on Facebook and look up her birthday.
I hope you stick around on the forum! You're welcome to post any astrology questions you have.