@Mathiason The idea that she is in love with the MC is a ridiculously convoluted interpretation that is not based on anything shown in manga, but even if it ends up being true, it negates nothing of what I said. I never said she was just "musclebrained", and I do think it is based on her arrogance. (There is evidence from the manga for my interpretation that she can't accept the idea that he is better than her, because her pride won't allow it.)
Whether her motivation is pride or "completely misunderstood love" however, doesn't change the fact that what we've seen indicates that, until she is killed, she will keep challenging the MC over and over again, while being rude to him. In my opinion, she adds nothing to the story, and simply detracts from it, so her getting killed is the quickest way for her to stop entering the story. I've seen no redeeming qualities from her, and I don't want to know more about her, her tragic backstory, her years of dedicated training, or any other plot involving her. I just want her removed from the story, and based on what we've seen of her so far, that will take death. (I doubt she will get killed, but I'm hoping so.)