My cousin Bosco OConnor of Kilcooly whose wife is Maureen O'Sullivan wrote me this:
"My wife's distant ancestor is one of the 'Scotch' Fitzgerald.
Her name was Catherine Fitzgerald, baptized 5 July 1829.
She married Patrick O' Brien of Ballyganeen in Ballyferriter on the 21 Feb 1852.
They had three daughters:
Maria O' Brien -- born about 1853. She married Muiris Martin of Kilquane in Ballyferriter Church on the 4 Feb 1871.
Catherine O' Brien -- baptized 5 August 1855
Narry (Hanora) O' Brien -- baptized11 July 185.(My wife's, Maureen, ancestor). She married Sean Tom Begley and they lived in Ballyganeen.
Maria and Narry have many descendants in this locality.
I haven't any information on Catherine O' Brien."
Hope you find something helpful there,