i must say that i too agree with bein.
Btw have you ever considered that she might be fealing a little insecure? is it possible that she actually wants your attention but is scared to show it in case she comes across as a silly girl with a crush?(it doesn’t necessarily mean that she has a crush – could be she admires you/looks up to you but is afraid of looking as though she has a crush) So she thinks that perhaps the perfect way to make sure you notice her without noticing that she admires you is by completely ignoring you.