[6] Webb is not to be confused with her cousin also called Isabella Gertrude, born 28 October 1877, whose parents, William Henry (Charles' brother) and Edith Ovenden née Lamb, who fought contentious divorce and custody proceedings in New Zealand, as a result of which a judge placed Webb's cousin in the custody of Charles and Isabella in Ireland.
[6] During this time she also working as honorary medical officer to St Patrick's Dispensary for Women and Children, attended two baby clinics, lectured, and acted as an external examiner to the Department of Agriculture & Technical Instruction.
Webb was lady district superintendent in the Alexandra College St John Ambulance Brigade in Ireland from 1914, and was on duty during the Easter Rising.
[6] During the conflict she set up an emergency hospital at the War Supply Depot, run by the Brigade in a building at 40 Merrion Square to deal with the wounded.
[12] Webb became focused on the treatment of childhood ailments, particularly those relating to poor diet and hygiene, reporting on the high mortality rate in children under one in Dublin.