There is a baptism record on www.irishgenealogy.ie (free site) that has a baptism record for a Bridget Sweetman.
Area - DUBLIN (RC) , Parish/Church/Congregation - SS. MICHAEL & JOHN
Baptism of BRIDGET SWEETMAN of N/R on 23 June 1842
|Date of Birth||N/R N/R N/R|
Further details in the record
|Sponsor 1||JAMES QUNN|
There are a lot of Sweetman records on this site, I suggest you check them out, unfortunately no record for John McGee, suggest you also try the spelling Magee and also post on our Dublin message board, the local volunteers might know more about St Michaels and John's Parish in Dublin