Even though only approximately six months have passed since Kim misread Luke's meaning about the fights, it's telling that she's able to get the better of Greg here. Though she's well aware that she's pretending to misread the situation, she's now able to figure out how to work the social system so it does things for her, not just acts against her. At the same time, Kim's cultural background (and fear of teachers) isolates her again, as she refuses to ask a teacher for help.