Marriage Record in the Abbey /Woodford area

Hi, My Great Grandparents were Patrick Collins (Born and lived in the Ballinakill/Woodford registration area) and Jane Mulligan (born Summerhill, Meath, but her family moved to Dublin soon after she was born) The 1901 and 1911 Census have Patrick and Jane in Ballygowan/Ballinakill, and the 1911 Census has them married for 18 years, with their first child, John born in June 1893, so that puts their marriage at about 1892. We understand they were both working for the estate of the local landowner John M. A. Lewis when they met - he was a Shepherd and she a nurse.

I have hunted everywhere for a record of their marriage, but have not yet found a record. The East Galway Family History Society in Woodford have no record, I have looked through over a year's worth of the online copies of the parish records and couldn't find anything, and the Parish Priest at the local church at Abbey replied that he had no record.

Any other ideas would be welcome.

Patrick born 1867, parents were Michael Collins and Honor/Hannah Halloran.
Jane born 1871, and her parents were Patrick Mulligan and Jane Enniss

Many thanks

Jan Collins