Hi Kay
Both those Ritson girls have baptisms in the IGI, each with a father John Ritson. However, it may not be the same John Ritson in each case because Brian Lawson's wills index has an 1833 Braddan will for a John Ritson which would be worth seeing in case he was the father of your Jane b 1827.
Now's the time for you to practise your familysearch technique to find the baptisms of Ann and Jane Ritson. If you still keep drawing a blank, email me at faircork (hyphen) tree (at) yahoo (dot) co (dot) uk and I'll try and find out what you're doing wrong.
Jean C