Chapman/Walsh Family

My 2nd great grandfather, Andrew Chapman, a weaver, was born in Kilfinane about 1806. He married Ann Walsh in Kilflynn parish 18 Jan 1837 (Church of Ireland). She was Roman Catholic (born about 1821) and he was Church of Ireland. They had 7 children born in Kilfinane, emmigrated to London, Ontario, Canada about 1852 and had one more child born in Canada.

I am interested in learningabout Ann's parents; I do not know their names. I believe she was also from Kilfinane and that they went to Kilflynn to marry because there may have been disapproval on both sides in their home parish. The first couple of children were baptized CI, the middle couple were baptized in both religions and the younger ones RC only (info from Irishroots). In Canada the census lists them in 1861 as all being Church of England but after that Ann and the children are RC and only Andrew is CE.

I would also be interested to know if there is any information in Irish records about when exactly they left. Since Canada did not routinely keep ship records until 1865, I've struck out looking for anything there. Griffith's Valuation has Andrew leasing land from Frederick Charles Trench and Miss E.O. Gascoigne. She was Elisabeth who in 1852 married Fredericks cousin and they lived at Castle Oliver in the parish. Frederick was married to her sister. I have read that Elisabeth and her sister Isabella were quite progressive and good to their tenants but the Trench men wanted to unburden themselves of most of the tenants who they had to support. I've wondered if Andrew and his family left willingly and if the Trenchs paid their passage.

Any information or tips on resources to persue is greatly appreciated.