In 1916, Romania formally entered the Entente, and, after brief successes, was invaded by the Central Powers. In the battle for Bucharest, the Elena Doamna School became an overcrowded military hospital, and Miller-Verghy a registered Romanian Red Cross nurse. During the occupation of Bucharest, in June 1918, she and Maruca Cantacuzino helped establish a philanthropic society for the war orphans. Financed by charity shops, it continued to assist children in need even after the defeat of the Central Powers and the return of Bucharest into Romanian hands.