I actually searched all the 1911 census for all counties in Ireland that had 'possible' Mary Copelands who could have had a child in 1919. There is 17 and I have the .pdf of those census. There are a few, but since Copeland is not that common a name in Wicklow I wondered if I should go afar, thinking that my GGM could have travelled.
The other Mary Copeland in the Union Hospital in 1918 was 35, still able to have a child then .
Thanks for the reply though.