It was a beautiful evening, mild and still, and the drive was as pleasant as the serenity of Nature could make it; but when Mrs. Norris ceased speaking, it was altogether a silent drive to those within.
She looked suspiciously at her sister; Maria’s countenance was to decide it: if she were vexed and alarmed—but Maria looked all serenity and satisfaction, and Julia well knew that on this ground Maria could not be happy but at her expense.
There are no more uses of "serene" in the book.
Show samples from other sources
While I lie awake worrying, she sleeps serenely.
She remained serene even when he was yelling at her.