She´ll blush and look away, then look at you again, or she´ll keep staring with anticipation: Go and say hi. Or she will keep an analytical stare and break it—like she wants to be worked for: Hold it. She´ll come when you're with another girl. Or she will be disinterested, or you will, it doesnt matter. But if you liked her and you're curious, go and say hi, find out if she's cool. As simple as that for dating success.