i know you are probably going by greatgrans death cert for her age making her born 1877 but do you know if she ever had a pension,i seen on here yesterday where if the person had no birth cert the pensions office? went back through the census forms to see when they first appeared on the census,these searches are recorded i have seen some in National Archives Dublin but am not sure wheter they exist for applications after 1922. Just a last straw for you to grasp at.