She obviously hates you and thinks you're fugly /end sarcasm
Now that sarcasm is over, I'm going to add and say that if you get "big" smiles and grins, that's an "ooh you're cute" reaction, or "i'm already in a great mood" smile.but I disagree with the answers who are saying its just politeness because I give small polite smiles to guys I don't think are cute.totally different than big happy smiles. Some girls are just very happy friendly people and will give big smiles to everyone, but if you get those frequently, its more likely girls are finding you attractive
Hmm... I have a big problem with this.. I have like social anxiety so I tell myself that I have to smile at everyone and this kinda freaks me out because I'm like "great.. why did you smile? now this guy probably thinks you like him!" lol -.- because I feel like I have to smile and then it makes me look like I wnat them..
Either she does wnat you.. or she's being nice.. you really can't tell lol
But girls do smile at guys they like or want to approach them I guess *shrugs* or she could just be being nice but smiling relaly doesn't hurt shows that she's friendly
She thought of something funny, you looked funny, she's listening to a song she likes, she's just being polite, or maybe she thinks you're cute. But more likely, she though of something funny and couldn't repress a smile, or was just being polite.
Politeness? Sometimes I notice guys staring at me (I don't think they're checking me out, but it nonetheless makes me uncomfortable) and I just smile to break the uncomfortableness (and it usually works, which is good) Sometimes I make eyecontact with a guy and I don't want to come off as weird or unsocial, so I'll try to smile back. I give the same smile to everyone, cute or not.
Could be several factors but here's a bit of insight to the female psych. From the time we're able to talk and walk we are taught that we need to be everyone we come across. At least that's how I was raised. When a stranger passes, you smile and say hello or smile and wave if there's glass seperating you. We don't always remember to do this cause as you can imagine, it gets very tiring but we do remember it most of the time.