"Thank you for your concern, but I do know how to pick my fights." It's light with an undercurrent of steel - she's seen how bad things are getting, and she's been told who's causing it. She can hold her own against Sans; she's not about to go up against someone who can destroy her with a wave of their hand.

She raises an eyebrow, letting Sans talk, and stands up when he's done. "When you're done acting blameless, do let me know. In the mean time, I'm going to get another cup of tea. Would you like one?" She barely waits for his answer before heading back to the kitchen.