Is she a real friend or not?

I am not going to tell you to ignore her too because 2 wrongs don't make it right, but you should ask her the reason why she ignored you at the display, then if she doesn't care to tell you why she ignored you in public, or if she gives you a lame excuse, make sure you let her know that you wont tolerate her attitude next time. Print her bio-Lab and keep being friends, don't let her treat you like that in front of boys, because the first time she does it and you don't do anything, she will keep doing it. And that is not behavior of a true friend.