She took an active role in promoting the Girl Guide movement, the Voluntary Aid Detachment (VAD), the Land Girls and in 1918, she took a nursing course and went to work at Great Ormond Street Hospital.
Мария приняла активное участие в популяризации движения девочек-скаутов ("Girl Guide"), Добровольческих подразделений помощи ("Voluntary Aid Detachment", VAD), Женской земледельческой армии ("Women’s Land Army").