Nerve, perhaps, wasn't the best terminology used to describe her; it was more of a lack of sense that allowed her to continue pestering her brother with defensive remarks and light bickering. At least in the case of Meta, defensiveness was probably the best word to use — their Gryffindor of a sister wasn't here to defend herself, and as the only other non-Slytherin sibling in their family, Frida felt it was her duty to stand up for her.

"They're... somewhere," she managed, her head lowering to avoid the (antagonistic, as she assumed) gaze of her elder brother. She didn't really want to fight with him, yet he went on the attack during every exchange. Was he really so displeased with her evaluation — or even her as a person — that he would snap at her for seemingly nothing?

(Yes, of course he would, because this was Kristoffer.)

"They're probably studying for exams. I- I've already studied today," she offered as her only explanation.