There are no words for this.
Walter clutches at her hand, fingers scrabbling weakly at the skin, and she squeezes back tighter, knowing that he will feel it, knowing that this new pain will ground him.
He does not know who she is, not always, and sometimes he thinks that she is his wife, there to take him away with her, but that doesn't matter.
All that matters is that he is smiling and cannot feel the pain that is paralysing him and she doesn't care right now what Jared has to say about that (and she knows it is a lot).
Instead she feels her thumb rub gently over his hand, feeling his grip slacken.
There are no words for this on any planet.