This is the struggle they'd tried to train her for in the scant weeks between the end of the world and the end of Company B; the tightrope act of telling the truth whenever possible, while not revealing so much as to make yourself compromised by giving away the upper hand of knowledge. The more she gives away about her brother, the more danger he's in too, without ever agreeing to play this part.
"We fought," she agrees after a moment. "He wants to keep his big sister from getting hurt, so he lied to me about a lot of shit. He doesn't understand that it's my job to keep him safe, and he's an asshole who's always made it hard for me." The words are harsher than the voice that speaks them; calling Cal an asshole is practically an endearment, and the younger of the Davidsons would take it as such even if she said it to his face. Willa's hand reaches out for Sweet Melissa, letting her thoroughly sniff and lick and gently gnaw a finger before shifting to stroke the back of her head, mask the scent of chicken with the scent of dog. "Do you know what I mean if I say that I would do anything?" she asks, scrutinizing the convicted killer with a frank stare. "Absolutely anything, to spare him suffering."