 She led a group of nurses from the United Kingdom to Serbia in 1914 during the First World War, becoming good friends with Flora Sandes.Early in July 1915, Grouitch, now the wife of the undersecretary of foreign affairs in Serbia, turned over a sum of money to the American Red Cross, and requested it to organize a unit consisting of two doctors and two nurses to proceed to Serbia with the necessary equipment and supplies to establish a hospital for infants and young children.These funds were collected as a result of her labors from philanthropic people in the United States, and from time to time since then other donations for the hospital came and were added to the fund.