Honestly, it could mean several different things, it depends on a lot of things. It could be little things like, something happened and she just doesn't want to face you right now, she doesn't want to see anyone because she might be in a bad mood or it could even mean she likes you so much and might not think she is pretty enough for you to see her or maybe she had to go get something ( maybe even to give to you;) ). It could mean anything.
when a girl walks away and you are POSITIVE she likes you, then she is doing that because she doesn't want anyone to know she likes you but you.
that means she likes you
She has no response, she's a little embarrassed but she is pleased. She likes you too but needs time to show you.
she likes you
It could just mean that she's being friendly. Or, she likes you, but she is nervous to tell you, because she thinks you won't like her back.
She likes you.
She is either attracted to you or you are sending unwelcome signals to her. Those are the only two reasons I can think of.
it means she likes him
If he walks away from you and blushes I'm pretty sure he likes you, I mean that's what happened between me and my boyfriend before we started dating. So don't give up. :]
It doesn't necessarily mean the girl likes you, but it does mean that she likes to tease you and be mean to you. I guess she wants to see the reaction from you and then says she was only joking. In my opinion, she is playing with your feelings. I would walk away.
Obviously, being a girl, she likes you.
It could mean that he likes the girl that likes him. :)