|Appearances:||Sharpe's Siege (TV Movie)|
Catherine's brother, the Comte de Maquerre, left her and her mother to become a spy. In 1813, Catherine's mother fell ill with fever. Shortly after, Major Richard Sharpe and his men took over the castle. Initially resentful of the deception he used capture the castle, she was pleased that he intended to let the garrison go. Catherine opted to stay as her mother could not be moved. Sharpe allowed her to do so. She rejected the advances of Horace Bampfylde, shunning him.
Sharpe had recovered some quinine on the way to the castle, and Catherine asked him for it, aware he required it for his wife, but she did not expect Sharpe to survive the night as General Calvet was preparing to attack. Initially, Sharpe was reluctant to give her the quinine as he knew this would show his men they were unlikely to be going home. However, he eventually told Harris to take it to her. In gratitude, Catherine told him of the oyster shells in the castle's cellars and instructed him to burn them. With the lime produced through burning, they planned to blind the French.
In gratitude to Sharpe for his part in helping her mother, she later offered him her virtue. He declined, hiding his amusement, telling her he preferred gold, after which she branded him a monster.
Catherine's brother returned to ask Catherine and her mother to leave before the French attack. She refused telling him that she no longer knew him.
The French were repelled through the use of the lime and the Castle was held. Catherine made her goodbyes to Sharpe before he left. (Sharpe's Siege)
The characters of Catherine and her mother were creations for the movie adaption and did not exist in the novel. The intelligence about the oyster shells was information passed on by the American Privateer, Captain Cornelius Killick in the novel.