Hi Collette,
Thanks for the post about finding some information about Margaret Mary Coleman. As she was born before 1864, the records would be church/parish records, so the only place to start would be with the
National Library of Ireland online records. The records are based on the area in which she would have come from, so without the parish, it will be a tricky journey.
Irish Genealogy is another handy website for searching both civil and parish records. You mentioned her husband, Dennis Moylan, came from Kanturk, County Cork, it may be they were from the same area, and either travelled together or met once in America. Perhaps try the Catholic Parish of
Kanturk records to find him and possibly Margaret too.
The surname
Coleman is popular around Cork and Dublin in particular, so again, records might be available for Margaret. It will be a tricky task without a specific area to focus on; you may also find the census records at the
National Archives another source.
Best of luck,
Martin