Watching her, Mrs. Glass, who happened to be a great judge of young girls’ figures and young girls’ walks, once again, in lieu of a smile, tightened her lips a bit.
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.