It's not that Sina doesn't want to talk to Nari. But as soon as she comes in from the healing tents, her hands bandaged and her face weary and her posture small and defensive, all she wants to do is hide. If she tries to talk to her clansister, she'll start crying again, and she won't be able to stop. She'll have to relive everything, and answer questions that she doesn't know how to answer, and she just... can't.
So she glances briefly at her as she steps inside, then immediately goes to her bedroll and lies down, facing away from Nari. There is, at least, no vibe of hostility or mistrust given off: just desolation, exhaustion. She curls up tightly and tries not to move.