Gretchen joins the Cool Asians at the end, and is shown sucking up to them in broken Vietnamese. What does it say about her intelligence that she is capable of learning another language at a conversational level on her own, in high school, as a social activity? This may also explain some of her disillusionment with the Plastics, and in turn, why she was targeted by Cady, Janis and Damian to break up the clique -- she might have been upset with having to hang around with people like Karen and Regina in order to be popular. And not for nothing, but she was the only brunette in the group.