Following the executions of her brothers in the aftermath of the Easter Rising, Margaret continued to run St Enda's School. She was the matron and housekeeper for the school, while her mother was the headmaster. The school began to experience financial difficulties in 1916 after the Easter rising, and was facing closure. Trips to the USA were made to raise funds for the school. The school was saved mostly by donations and continued to operate even though it was operating at a loss.