Mrs. Grant offered herself as companion for the day to Lady Bertram in lieu of her son, and Dr. Grant was to join them at dinner.
There are no more uses of "in lieu" in the book.
Show samples from other sources
Immediately after collection, Maycomb Methodists sang what they called the Doxology in lieu of the minister praying over the collection plate to spare him the rigors involved in inventing yet another prayer, since by that time he had uttered three healthy invocations.
Harper Lee -- Go Set a Watchman
In lieu of Colin’s laugh came a period of unbreachable silence.