The answer to who Lucy married is .......... Thomas Roche!
Lucy's father is correct and deceased as his should be as he died when she was less than 1 year old.
Lucy was born in 1883 to John Boland and Ellen Ronan in Liverpool. When John died, Ellen later married James Carson(1886) in Liverpool. When I found Ellen's father and mother (Patrick & Ellen) in the 1901 Irish Census living in the Ferns area of Wexford, I found Lucy, who I didn't know about, living with them. Ellen's marriage cert to James Carson showed that she'd been previously married to a Boland.
It looks as if Lucy would have been around 34 when she married, so not much chance of children being born to the marriage.
I can find a Thomas Roche in the Ferns area (as marriage cert) living with his married sister Jane Stephans and her husband Henry. Thomas is single and 40 in the 1911c, so about 47 on marriage.
If anyone has any information on Lucy and Thomas Roche, I'd be very grateful. Kit
Edit - forgot to say that they married on 5 August 1918 at the Roman Catholic Church of Kilrush and the witnesses were George BUTLER and Ellen RONAN. I think this Ellen is Lucy's cousin, the daughter of her mother's brother Matthew. Today I visited the cemetery at Kilrush (eventually found it!!). The original church is not longer there and a modern one in its place.