Catherine Lodge (nee McNeill) died 1906 Port Glasgow. ** (see added below)
Once you have her marriage certificate you will get her parents' names. This should lead to her parents' Scottish death certificates, to census records, and possibly to Irish records. (If we can help - just ask.)
**ADDED
On her death 1906 - Catherine’s Lodge’s mother maiden name shows as McIlheron.
Possible death-
Catherine McIherin / McNeill / Cameron died in Gourock in 1911, age 69 (so if the informant has remembered correctly, she had 2 marriages – to Cameron and to McNeill). Her mother’s maiden name was Blaney
I have been lurking in the background of this thread, and with all the hints given, I think that the parents of Catherine are Hugh McNeill and Catherine "McIlherin", or some version of that.
The spelling of the names make it difficult; McNeill is more often McNeil on earlier records; later records are more often McNeill. The name McIlherin is simply mangled with many forms, such as McHeron, McElherran, etc.
I believe these are Catherine's marriages:
Catherine McElherran marriage to James Cameron, Port Glasgow, Renfrew on 11 Mar 1867
Catherine McHeron marriage to Hugh McNeil, Port Glasgow, Renfrew on 01 Jan 1872