It means that she knows you exist and is greeting you. dont read into things dude XD
crush
When a girl blushes is generally means she likes you.
It means she likes you or she wants to go on a date.
When a girl (or guy) says "Hi", say "Hi" or "Hello" back.
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 LIKES YOU or she likes you as a friend. or she was talking about you
she's probably either mad at you, or she has a crush on you, or one of her friends has a crush on you.
When a teacher you know says hi to you it means they are being polite and acknowledging you.
It usually means that she is interested in you: Wants to be your friend, Thinks you're attractive, Or likes yo.