She's not even denying it to herself anymore. She likes him a buuuunch. She's actively kicking him to maintain her position as the bully type, making sure that both he and herself are aware of the dynamic that she's comfortable with. Because being in love means being vulnerable and that's exciting and scary.
Fuckin A, Nagatoro, I wish you'd kissed the boy. You might have gotten sick but I REALLY WISH you'd kissed the boy.