For Isa(belle) Breen M ????, Kilmore CI parish, I found 1 rcd in 1880. This MAY be for this ancestor. A view of her detailed rcd SHOULD show her parent's names and the groom's name. This will validate/invalidate the rcd.
For ???? Reid M 1880 (exact), ditto, I found 0 rcds. This infers the Isabelle rcd is a false positive (or a 2nd marriage).
For William Breen M 1856 (exact), Co. Armagh, I found 1 rcd in Kilmore CI parish, none in Rich Hill.
For Ann(e) McCann M ditto, I found ditto. This and the rcd for William are highly likely to be for your ancestors even though the place of marriage doesn't agree with your info.
For Ann(e) McCann B 1832 +/- 4 yrs, Co. Antrim, with a father forenamed Ter(ence), I found 0 rcds.
For Mary Breen B 1845 +/- 4 yrs, Co. Armagh, with a father forenamed Henry, I found 0 rcds.
For Isa(belle) Breen B ????, ditto, ditto.
For Henry Breen M ????, somewhere in Ireland, I found 0 rcds within a relevant range.
Note - rcds for northern Ireland in general and for protestants in particular, are especially sparse.