Dodo's Daughter by E.F. Benson

Nadine enquired at Hugh's door again that night before she went to bed, and found that he was still asleep. She had promised her mother not to sit up, but as she undressed she almost smiled at the uselessness of going to bed, so impossible did it seem that sleep should come near her.

After her one outburst of crying, she had felt no further agitation, for something so big and so quiet had entered her heart that all poignancy of anxiety and suspense were powerless to disturb it. As has been said, it was scarcely even whether Hugh lived or died that mattered: the only thing that mattered was Hugh. Had she been compelled to say whether she believed he would live or not, she would have given the negative. And yet there was a quality of peace in her that could not be shaken. It was a peace that humbled and exalted her. It wrapped her round very close, and yet she looked up to it, as to a mountain-peak on which dawn has broken.