Three issues with what your are trying to do.
1. Scottish women traditionally did not change their name after marriage. The further you go back the more common it is. The key is to look at the middle name of the children . It is often the mothers maiden name.
2. Scottish were not good at recording deaths. ( try looking for wills. ). If not good luck finding any death records, excepting the most wealthy. Undertakers records, etc???
3. Try looking in neighbouring parishes. Often the minister was missing . I have found place name errors due to wrong entries from bad hand writing in census records. Also Parish records sometimes were distroyed . Remember Scotland has had a violent past WWII bombing, fires, floods, etc. look for other clues such as tax records, land tax, clock tax, voter rolls, etc. there was even a carriage tax and window tax once in Scotland! Oh another though, post office directories came in about 1790. Try those . Widows address' came up after their partners died.