I think your GG Grandmother Mary Shannon was a sister to my
GG Grandmother Ellen Shannon.
My Grandmother was born Mary Ellen Moran Bacup 1897, her Mother was Mary Ann Moran nee McManus born 1876 Aughmore co Mayo (as stated on 1911 English census)baptised Kilmovee. She married her Husband John Moran in Bacup 1896. That takes us back to her Mother who was Ellen McManus nee Shannon born 1842 and married John McManus a baker in 1872 Kilmovee. She died there in 1880. My Grandmother's family left Bacup in 1901 to live in Newcastle upon Tyne Northumberland.
There are lots of Morans and McManuses in Bacup at the time of the 1891/1901/1911 census some of whom are think are related to my family. Here are some addresses I have for them.
My G Grandmother Mary Ann McManus was married from 7, Allen Street her Husband John Moran was living at 3 Sandhole Row Stacksteads. Mr Grandmother was born at 4, Slackbottom Bacup 1897,her sister Catherine was born at 5, Taylor Holme in 1898 and they were there a year later when Catherine died.
I live in Portsmouth on the south coast of England