Matilda, younger sister to Rosalie Murray, is one of Agnes’s students in her second governess position. Fourteen years old when Agnes arrives in the Murray household, Matilda is a thorough tomboy, who loves riding, hunting, and repeating the curse words that she has learned from her father Mr. Murray and his grooms. Although Matilda’s unladylike behavior predates Agnes’s employment with the Murrays, Matilda’s mother Mrs. Murray nevertheless blames Agnes for not using flattery to make Matilda behave in a more feminine manner.