i guess she'll do the same to you in return to show that she likes it and to the OP i would say if you are quite positive the guy likes you i think is not a wrong move to ask him out.how u ask?you could ask him thro phone(text or call) or jus do it on9 if it feels better.then you can start talking to the guy in real talking bout stuff related to the stuff u talked thro ur convo on9 or phone, then you could ask him if he wants to catch a movie or so.tat's my idea only i m sure there are 1001 ways for a shy girl to ask a guy out