Plus, if you don't know her too well, you really can't say you like her coz what + and - do you know she has in terms of personality and stuff? All you can say at this moment is that you are attracted to her. I think attraction is fine with girls but if you say you like her like right out of the blue then she's going to say 'huh?!' 'sides, girls are like probably masters of understanding non-verbal cues, so you don't actually have to say it, just do it (as Nike points out hehe).