Waaay too many reasons to type out in one answer, but don't worry most of the time this is a good thing. :) People blush when they are embarrased but they also blush when they are flattered, in this case assuming you said something nice to her she blushed because she liked what you said to her, and possibly could be having feelings for you.
It is because a lot of girls appreciate a guy who is really nice and helpful to them.
Girls tend to blush around guys they like.
LOL well it obviously means that she likes him. Girls typically blush when they like a guy.
Differs from guy to guy, however, most guys like nice girls.
It means that the guy is cute and the girls wish to be with him
The girl likes that guy or finds him attractive.
that means that she likes him or is attracted to him in some way bcuz girls almost 98.9% of the time usually blush around a guy when she is interested in him. I should know cuz im a girl and i always blush ALOT when im around a guy that i like ;)
Cause most guys suck and girls are just happy your not a douchbag. Congrats.
Girls may blush dark red with anyone who they might be embarrassed by or infatuated with, regardless of faith.
they like that guy
You should ask them why.
She finds him attractive, most likely.