1868 stroke which left her partially incapacitated; this forced much of the children's upbringing to be overseen by her husband. Her third daughter Lady Victoria, who also suffered from ill health due to a contraction of poliomyelitis, nursed her mother. Once adults, the children's marriage settlements were a drain on the family's resources, with all but one eventually marrying. Their eldest son John married the Queen's fourth daughter Princess Louise in 1871, and became the Governor General of Canada in 1878. Like her mother the Duchess of Sutherland, the Duchess of Argyll was a prominent supporter of the abolitionist movement. Elizabeth was one of many British women affected by the 1852 anti-slavery novel Uncle Tom's Cabin. The following year at her mother's house, the Duchess helped draft a letter titled An Affectionate and Christian Address of Many Thousands of Women of Great Britain and Ireland to Their Sisters, the Women of the United States of America. The letter, eventually signed by 562,848 women, called for an end to slavery because the institution did not recognise slave marriages, led to parent-children separations, and prevented slaves from receiving Christian educations. It was sent to the author of Uncle Tom's Cabin, the American abolitionist author Harriet Beecher Stowe; she and the Duchess of Argyll became friends, and maintained a correspondence. Harriet Beecher Stowe would often visit the duchesses of Sutherland and Argyll when she travelled to England and benefited from their connections to senior politicians. The Duke and Duchess of Argyll were also friends with American politician and anti-slavery leader Charles Sumner, leading historian Amanda Foreman to write that the "relationship between [the Duke of Argyll] and Sumner would prove to be one of the most important friendships of the Civil War." In December 1868, Lady Campbell was appointed Mistress of the Robes to Queen Victoria, succeeding Elizabeth Wellesley, Duchess of Wellington as a member of William Ewart Gladstone's first ministry. She resigned the position in 1870 due to ill health, and was succeeded by her sister-in-law Anne Sutherland-Leveson-Gower, Duchess of Sutherland. In December 1877, Queen Victoria created the Order of the Crown of India and conferred it upon the Duchess of Argyll and dozens of other royal and noblewomen. She was also a member of the Royal Order of Victoria and Albert, Second Class. The Duchess of Argyll died on 25 May 1878, whilst eating with Gladstone in London. She is buried