"Yeah, of course." Sure. That vague agreement is most definitely only about taking care of herself and not Cassian tacking on a platitude because she obviously can't keep her upset to herself.

"I'll be right in there if you need me."

But he won't because everything he needs and wants is settled in his arms. Jyn brushes her hand over Rey's downy soft hair for a moment before she moves back to the bedroom, slipping inside and leaving the door open behind her. Just in case. Time to crawl into bed and regret 99% of her life until she passes out.