After the Rising Rooney went with her sister to work in Glasgow. Since they knew no one there they soon joined the local Cumann and got involved again. Alec Carmichael had arranged for the women to visit home and transport ammunition, explosives and fuse. The day before travel Rooney was in a tram accident and the police were involved. Transport during the First World War was difficult but through careful application of stories and wearing the fuses on her arm in a sling as if injured, which was supported by the injuries from the tram accident, they managed to get through. Once they returned to Glasgow and waited a few months they managed to repeat the exercise. Later in 1918 she was holding ammunition and gunpowder for Joe Robinson who was under suspicion. In 1919 she returned home for the last time, bringing another round of ammunition and explosives.[2]
Rooney moved home which was being used by the Volunteers for storing ammunition, having meetings and collecting anything needed as well as hiding men who were hiding from the authorities. She went on various activities like helping check out an ambush site in advance and being present during it to hide the guns for any men who fell.[2]
The Byrne house was used as a first aid station and Rooney was the nurse on duty for the wounded men during Bloody Sunday.[2]
Rooney married in 1922 in Dublin and died in March 1971.[1][2]