In 1919 Mudie-Cooke came to the attention of the Womens Work Sub-Committee of the newly formed Imperial War Museum which acquired a number of her paintings for its fledgling collection.
This purchase included her most famous picture, In an Ambulance: a VAD lighting a cigarette for a patient.
In 1920 the British Red Cross commissioned her to return to France to record the activities of the Voluntary Aid Detachment units who were still providing care and relief there.
Her paintings from this visit include examples of war damage, the shattered landscapes of the former battlefields and women tending graves in a cemetery.
Some of these images were reproduced in a limited edition of lithographs entitled: With the VADs in France, Flanders and Italy.