She's not upset about sending Peranza to Hell, she's genuinely not. But - but she's not going to become a devil there. Hell can't fix her. Abrogail warned them, that all this niceness had a flip side, that if they betrayed the project then they'd hurt, forever, even if that wasn't profitable for their owners, even if it was a waste -
So Peranza shouldn't have done that, should she have. You can't not follow through on a commitment like that once you've made it; if anything, that means people will force your hand more often. Maybe Carissa was too nice, and that's why this happened.
"Right. Then kill her."