Elizabeth Murphy

I am trying to trace the ancestors of Elizabeth Murphy , born in Wexford Co. (parish unknown) in around 1856 to 1858. I know her fathers name is John Murphy and he was a shoe maker in September 1872.

The story goes as follows:

Elizabeth Murphy (a Roman Catholic) married an English Soldier Private Henry Potts of the 37th Regiment, Portobello Barracks, Dublin on 16th September 1872 at St Brides Church (Church of Ireland) (St Bridgets). At the time she was residing at Gt Ship Street, Dublin. Elizabeth's father was listed as John Murphy a shoe maker on the marriage certificate. (This is the only information I have on her parents). The family tale states as she was a Roman Catholic she was disowned for marrying her English Soldier. She reportedly had 12 or 13 brothers and she was the only female child.

I am unsure whether John Murphy and family also resided at Gt Ship Street in Dublin, or whether they remained in Wexford Co. What was Gt Ship Street like in 1872? 

I would love to trace her family as she would be my Great, Great, Great Grandmother. I would like to know her mother's and brothers names or any information on the family. Any information would be greatly appreciated. I am named after my great grandmother Elizabeth, and she was named after her Grandmother Elizabeth Murphy. It seems we all had a rebellious streak!!

Henry and Elizabeth went on to have 2 children, John Henry Potts born in India in 1875 and Mary Ellen Potts born in Fyzabad in 1877. In 1881 they were residing in the New Infantry Barracks, Fulford, York. From there the trail goes rather cold, I believe Elizabeth (Murphy) Potts may have passed away in around 1884 in Derby England.

Any help or information would be fantastic, thank you.