crush
When a girl blushes is generally means she likes you.
You can respond by saying hi back and asking how she is doing. Engage in a conversation by showing interest in what she says and being friendly.
It means she likes you or she wants to go on a date.
it means she doesn't want to make eye contact with you or that she is shy and that she likes you
Obviously, being a girl, she likes you.
You would probably say hi back.
you say hi she says hi then you ask how are you and see where it goes from there
she's probably either mad at you, or she has a crush on you, or one of her friends has a crush on you.
she LIKES YOU or she likes you as a friend. or she was talking about you
It usually means that she is interested in you: Wants to be your friend, Thinks you're attractive, Or likes yo.
When a teacher you know says hi to you it means they are being polite and acknowledging you.