It's a no and a yes... It depends on who the girl is (BTW I am a girl too) If the girl is a nice and shy girl, she will probably act like that to everyone that says hi. If the girl is not a shy type of a girl... then maybe she does like you:)
Yes... But could be a bad thing though... She may think she would be over her head with you... I would try to sit with her and her friends and get her comfortable with you... She still may hide or protect her true feelings... Ask her out... Movie, pizza, with her friends and yours... Puts everyone at ease.. Good luck..