 Since she exhibited her works under the name, "E. Dorothy Willson," she is likely to have been known as "Dorothy" to differentiate her from her mother.She died aged 51 years of double pneumonia at The Retreat, York, on 10 October 1918.Mary Hilliard Willson (Leeds 22 March 1871 – Hill of Oaks 30 May 1928), daughter of John Joseph Willson, was the youngest of the Willson Group.