Most Helpful Girl
well, this kind of physical contact (touching a guys face) to me is pretty flirty, I mean, I don't touch my guy friend's nose or anyone's for that matter (except my bf).
so it might be sign that she is comfortable around you (enough to break a very strong physical touch barrier). thou you must be careful, if she only did it once it might not be that important, but if she does it constantly she might be flirting. :) good luck