Hello Mark,
Rose Cahill was not baptized in County Longford or County Laois (formerly Queens County.
I found her baptism transcription at the free irishgennealogy.ie website, which shows that “Rosana” Cahill was baptized in the St. Mary Pro Cathedral, Dublin City, on 16 July 1822, which is the date of baptism you have for her.
Her father is Lewis Cahill and her mother, Rose, no maiden recorded for Rose. These are the names you have for Rose's parents.
At the time of the baptism Rosana and her parents were living in Malbro Street, Dublin.
Your records show the residence of her family was "Malbroch," which would appear to refer to Malbro Street.
Malbro Street would be the abbreviation for Marlborough Street in Dublin.
Rosana's godparents are Patk (Patrick) Dowd and Mary Donly, which are the names of the godparents you have for her.
You can access the transcription at:
https://www.irishgenealogy.ie/view/?record_id=e74debe329-3690
Attached to the transcription is a link that takes you to a copy of the original St. Mary Pro Cathedral baptism register where Rosana's baptism can be found. The baptism register comes from the National Library of Ireland, Kildare Street, Dublin. Go to: https://www.irishgenealogy.ie/files/church/st.marys_pro-cathedral_mf_1820-1826_ba_0225.pdf
Once the baptism register downloads, you'll find that Rosana's is the 5th baptism recorded in the register, after the baptism of Marg Lynch.
In the right-hand portion of the baptism register is a column under the heading "Dues." I take this to mean whether or not the parents of the child being baptized had provided a donation to the church. In the row for Rosana's baptism, the answer is "Dues," which means her parents did give a donation to the church.
Mark, are you sure you have the correct information, as your gg grandmother Rose said she was baptized in County Longford, according to your records.
But, if you think the Rosana Cahill baptized in Dublin in 1822 does refer to your gg grandmother, I found the baptisms of five of her siblings at the irishgenenalogy.ie website.
For example, an older sister Eliza was baptized in St. Mary's Pro Cathedral on 28 September 1820. Her parents were Lewis Cahill and Rose, with no maiden name recorded for Rose. At the time of the baptism the family were living in Liffy Street, Dublin.
Eliza's godparents were Thos (Thomas) Donlan and Susan Fagan.
Four of Rosana and Eliza's younger siblings were all baptized in the Catholic Parish of Saints Michael and John, Dublin City.
These siblings and their dates of baptism are:
Christopher, 1 January 1825
Patrick, 12 March 1826
Lewis, September 1827
John, 23 April 1829.
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Each of the four baptisms noted above show that the name of the father is Lewis "Cahil," and that the mother's first name maiden names are Rose McLaughlin.
I checked each baptism record to see if any of the godparents had the last name of Nagle or Nagel, but none did.
Kind Regards,
Dave Boylan
Sources
irishgenealogy.ie
National Library of Ireland