It sounds like you need to get working on that paper trail Jade.
You don’t need your grandmother to remember anything, as Guy said, the Scottish certificates are very helpful.
The site you need is Scotland’s People.
https://www.scotlandspeople.gov.uk/You need to register and buy credits to view certificates, but the cost is very reasonable.
To try the site out, if you know your great grandmother’s name, try looking for her marriage on Scotland’s People. If you find it and download the certificate, it will tell you details about her husband and her parents. You should also look at siblings and their families, as the matches can be from side shoots.

DNA Painter will give you some idea about what sort of relationships to consider for a 935cm match.
https://dnapainter.com/tools8It is also worth contacting the contact again .... however unless you have a more detailed paper trail you still might not be able to work out how you match as you still might not recognise the names.
In addition keep in mind the possibility of “affairs” which can make the search a bit more complicated.
Added: I agree with Neale - if you would like help, post the names, dates, places, etc here and we will try to help. Don’t mention names of anyone still living (as that is against rootschat policy). If you would like to tell us the surname which appears in your matches, then do so, but do not include anything identifiable.