I have always introduced the unknown party to the known if i am bringing that person into the mix. It's just proper etiquette. Your friend is at fault for not introducing her to you. but she sounds like a little miss priss, and you handled it right.
But ownage? She forgot it as soon as she entered the mall.
dont worry man, next time a bitch pulls a stunt like this, im just going to stand infront of the tv, fold my hands and pout really hard. it will totally make her feel so bad and so low that she will have no choice but to give me my alpha male sex.