 She maintained her interest until 1921, two years after her husband had finally left India and the couple had taken residence in Chelsea.Duncan had been treated for tuberculosis in 1900, spending the summer out of doors in the fresh air of Simla, as chronicled in "On the Other Side of the Latch" (1901), published in the United States and Canada as "The Crow's Nest".Childless, she died of chronic lung disease on 22 July 1922 at Ashtead, Surrey, whence she and her husband had moved in 1921.