Great Grandmothers sister Susan

Hi I am trying to trace info on Susan Jackson (nee Lawler sometimes misspelt as Lawlor in records) she married a Thomas Jackson on 23rd June 1919 in Mullingar, they possibly had children called Ruth, Susan or Mary(family names) all of who may have married and this is where I lose the family, I have found that possibly one of the children died aged 4 but I can not link her to these parents, Anyone have any connections to these families. Susan's parents were called Edward and Mary Jane Lawler, Edward died in 1922 at Humewood Kiltegan County Wicklow. Susan was born in 1892 registered at Rathdrum but the family LAWLER moved to Mullingar. Any information or any links to the areas mentioned ??? I am coming to Ireland in August with hopes to visit places connected to the family! Thanks for reading. Janet Heasman