Wash isn't hurting her physically, but the way he hugs her back bursts a giant bubble of guilt in her chest. She can tell by the way he's breathing -that is, not breathing- that he's not OK and she tightens her arms around him.

But his breathing also tells her that he's slowly evening himself out. This is helping him, and that's good to know for the future. The future that both of them have if she has anything to say about it.

"Well, there was the giant fireball incident..." She hasn't scared Shiro quite like this yet, but it's still early for Team Voltron. And focusing on that distracts from the guilt that...she probably can't promise not to do it again.