"You could stand to do better." She replies, giving a small stretch as she does. She doesn't need to do it, but she's aware that humans used to call it limbering up. Truthfully, 9S did just fine time wise for a unit like his, but even if he isn't a combat unit, there's always room for improvement, isn't there?

She finishes stretching. "Put it on the highest difficulty, 9S." Because surely it was made with humans in mind, for it to be the top of their abilities. If she as a combat model can't cut that in a timely manner, then there's certainly something wrong.