Elizabeth Stanton (Staunton) Portadown, Armagh

My Great x2 Grandmother Elizabeth Stanton (spelt different ways) was born 3 Apr 1845 Portadown (married & died in New Zealand, arrived here abt 1865), Im trying to find out more about her life in Ireland, and her parents etc.  On her marriage cert May 1865 her parents are recorded as James Stanton and Margaret Musson, which we now believe to be Matthews.  Family story was that her mother died and her father remarried, we think its the opposite, as found a marriage for a Margaret Staunton to Clements Courtney 7 Jun 1854, Drumcree.  Margarets Father is recorded as William Matthews.  Another story is Elizabeths family owned Drumcree Farm.  Her father James Stanton was a member of the Orange Lodge.  Cousins William Beaumont 1844 Portadown, and his sister Mary also came to NZ 1864. There also could be an Aunt & Uncle Elisabeth & William Smith (Smyth) who also came to NZ, a marriage found for them 1863 Ballymore.  Elizabeths father is John Matthews, Williams is James Smyth.  Another family story was that Elizabeth went to school in Scotland, we know that she could read and write, she wrote many stories that were published in the papers.  I would love to find out more about Elizabeth Stanton (known to us as Grandma Green), and her family in Ireland, if at all possible.  Many thanks