Ireland, Catholic Parish Registers, 1655-1915; Name: Ellen Walsh; Baptism Age: 0; Event Type: Baptism; Birth Date: 1791; Baptism Date: 4 Aug 1791; Baptism Place: Cork, St Mary's, Cork city, Ireland; Diocese: Cork and Ross; Father: James Walsh; Mother: Anne Keeffe
It looks like Ellen's mother was not Mary Ann Walsh but instead Anne Keeffe. Her father was James Walsh (shown as husband of Mary Anne Walsh). This matches much better than the birth of Ellen 1791 to Mary Anne's marriage to Warner William Westenra Oct. 1791.