You wrote -
“I am trying to uncover details of Jane Lowe's time as Superintendent. Is there any evidence that she may have converted to Roman Catholicism during her time [1882 - 1883] in Southport? “
If Jane became a Roman Catholic, then one would expect a baptism entry in a church somewhere, probably close to where she lived. Baptism can only be received once and as most people are baptised as infants, this is not a problem. For adults seeking admission to the Catholic Church, this raises the question - “Has this person been baptised already?” At this time there was not agreed understanding of “Baptism” and so the priest would baptise the person 'Conditionally' - In this, the usual form of baptism was/is preceded by “If you have not already been baptised, I baptise you ...” This procedure has become much less frequent since ca 1970 when the main Christian churches reached a common understanding of Baptism.
Using Genuki Church Database (
https://www.genuki.org.uk/churchdb ) to find churches in Southport and then filtering for Roman Catholic churches shows that in 1882, the only Catholic church in Southport was St Mary on the Sands, established in 1841. The entry for this church (
https://www.genuki.org.uk/big/eng/LAN/Southport/StMaryontheSands ) shows that the early baptism registers have been deposited in Lancashire Archives in Preston.
Original Registers
Baptisms
1831-1897 held by Lancashire Record Office RCSO
Copies of Original Registers
Baptisms
1831-1941 held by Lancashire Record Office MF 9/136 264-265 - Microfilm
1831-1959 held by Lancashire Record Office Searchroom - Transcript
As far as I can see there are not any published transcripts of these registers.