Elizabeth married in 1874https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1874/11237/8120134.pdfIf she was your Maria she would have been at least 73 when she married.Elizabeth had a child in 1875https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1875/03114/2141999.pdfso she clearly wasn't in her 70s when she married.