I've attached the 1858 Griffiths Valuation head of household listing for Leck civil parish. There is a Patrick Dever in Ardaganny so I'm presuming that he is the father of Barbara. There are also three Lewis entries in that parish. I also looked for a Daniel Collins in Griffiths and the only one listed was a Daniel in Tullygay townland, Conwal civil parish. Possibly that is the Daniel who went to Canada. He would have been 30 based on your 1828 year of birth.
RC Church records do not appear to be available prior to the 1850s for the parishes listed. I checked on Roots Ireland www.rootsireland.ie for the marriage of Daniel and Barbara but there was no record.