Finding RC church records back to the 1820s in Co. Leitrim is difficult. Only four of the twenty-two RC parishes have baptismal records back to 1828 or earlier. I did search on the subscription site Roots Ireland and the earliest Bridget Banks baptismal record was in 1842. I also did not find any baptismal records for possible siblings to Bridget.
The 1857 Griffiths Valuation records showed 11 Banks records. Most of the records were in Drumlease civil parish but the only Patrick Banks records was in Killarga civil parish.