i see there is a Headstone for Mary Kirby and her husband online  which is quite large, i imagine from this they were not poor.
https://www.findagrave.com/memorial/149162922/mary-kirbyMary Kirby died 1892 + her husband + daughter Catherine Browne. Catherine's age transcribed as 24.
I can decipher only the first 2 names + at the foot,  the names of the people who caused it to be erected. 
           "In loving memory of BRIDGET MCCOWAN 
                           Ballinacarrica
               died 20th Dec. 1921 aged 81 years
               and her husband JOHN MCCOWAN
               died 6th March 1929 aged 96 years"
             " Erected by sons Edward & John USA "
Mary Kirby's death registered Westport SR district 1892. Farmer's widow, age 63, cause of death consumption. Informant Margaret Kirby, daughter-in-law.
Marriage registration of John Brown and Catherine Kirby is indexed incorrectly in Waterford SR district. I sent an email pointing out mistake. Her age looks like 16.