Pierre and Countess Roberts on 14 November 1914.As Earl Roberts' sons had predeceased him, the Earldom was allowed to pass down the female line.
Aileen became the 2nd Countess Roberts in 1914.
She was invested as a Dame Commander of the Order of the British Empire (DBE)
in 1918 for her services as Honorary Secretary, Officers' Families Fund and founder of the Countess Roberts Field Glass Fund.She died in 1944, unmarried, at the age of 74.
The 3rd Countess, like her father before her, would live to see the death of her own son, and only child, Lieutenant Frederick Roberts Alexander Lewin (18 January 1915 – May 1940), who was killed in action during World War II in 1940.