Am i too late in asking the girl that i like out?

This has happened to me so many times it's not even funny, only I've been the girl in the situation. I think just because she stopped looking at you doesn't mean she doesn't like you anymore, I never really stop liking a guy, if I liked him once and he's ever asked me out then I would remember why I liked him in the first place. One tip I have for you is that is you have no way of contacting her ask her friend who was signaling you over to have her number or address or something and ask her yourself, if the friend asks why you need it tell her/him that "I really need to talk to her, IT'S IMPORTANT!!!" and the friend will probably be all worried and give you the info.