Teren shoots Alistair a meaningful look; it's no accident that Anders is saying 'she' instead of 'you', though obviously she's not going to stop Alistair if he wants his share of the blame. Or... all of it, considering he did the killing, but Teren knows what being an accomplice is and is more than prepared to own it.
She stays silent for now, allowing him to make his own decision, looking as though she's on the tail end of having all her energy sucked out over the course of the day. Just let the nightmare end.