The tree you mentioned in the PM has her dying Nov 1965, Largs and also a corruption of her husband's name but no dates for the marriage. so far, I can find no deaths for her in Largs or elsewhere in Scotland or minor records with any of the names that might have been used. Nor can I find any newspaper reports. Checking any births to the couple is taking while as there are 3 different surnames, with variations, to check.
I think it might be worth you contacting the tree owner to ask where the information came from. I see that she is there as the sister in law of one of the ancestors.
She was definitely born in the year you mention and she married in 1962.
Alternatively, there might be a newspaper report of her husband's death in 2012 so, if anyone would be able to check newspapers covering Inverclyde for that year, please contact me and I'll give the details.
Gadget