[1] Knight worked closely with other leading abolitionists: Thomas Clarkson, Elizabeth Pease and Joseph Sturge.

A few women were included in the painting of the convention with Knight; these were Elizabeth Pease, Amelia Opie, Baroness Byron, Mary Anne Rawson, Mrs John Beaumont, Elizabeth Tredgold, Thomas Clarkson's daughter-in-law and niece Mary and right at the back Lucretia Mott.

In 1851, she worked with Anne Kent to form the Sheffield Female Political Association, the first British organisation to call for women's suffrage.

She died at Waldersbach, near Strasbourg, France, on 4 November 1862, at the house of the grandson of Jean-Frédéric Oberlin (1740–1820), a philanthropist whose work she revered.

A village, Knightsville in Jamaica, was named after her, or possibly after her younger sister Maria (1791–1870), who visited the West Indies in the mid-1810s with her husband, the abolitionist John Candler (1787–1869).