"I - I don't know if -"

But then she does know if. She knows exactly if. She knows that.

"Oh," she murmurs, and she shows him, soul-sympathy pointing with blinding obviousness: there, this one, this is forever. She is really not clear on how she missed it. Supposedly it can hide until it is too late to avoid; she doesn't know if that or the immediate circumstances or her own slow healing were operative, but now it is there, now it is clear.