My O'MALLEYs migrated to Liverpool from Oughaval as well, likely around the same time. Peter O'MALLEY married Mary MALEY there 01 Jul 1825, witnesses Michael and Catherine MALLEY. I know of three children for sure, Mary (1826), Margaret (1829), THOMAS (1930) ... my 3X-Grandfather ..., (Bridget 1835) all born in Westport. Peter and the girls are found in Liverpool and married there but Thomas emigrated to the States and married Anna Brown of Ballynahaglish, Mayo in 1853 in Butler Co, OH. Eventually Mary and Bridget settled with their children in the Louisville, KY / Jeffersonville, IN area along with Thomas and his family.
Mary their mother is not found in England and likely died before they relocated but I find no record for her. As every other person in that area seems to be named O'MALLEY or some facsimile thereof tracing our ancestors is tough. Your Ellen MIGHT be related to my bunch so I thought I would post what I have here. In which Liverpool parish are your MELIAs found?