a musebox

She turns her hand over to hold his. She appreciates his concern, and wants to reassure him. She knows he must be afraid for her. She's also grateful that his response is to be supportive and comforting rather than wanting to not talk about it. She's learned not to tell these sorts of things to her mother, for instance. And she can talk about it with Sherlock, but he's typically not very comforting.

"I'm okay," she says softly, squeezing his hand back in a silent thank you.