Hi Steve, Thank you for offering to take the tombstone picture.There could definitely be a relationship here to your grandmother. My research has been mainly in Scotland. Christina or Christian Blue who md Benjamin Marshall 12 June 1863 at Tradeston, Glasgow, lanarkshire.She was born 30 Oct 1831 in the parish of Kilcalmonell and Kilberry. She was the daughter of Dugald Blue and Mary Bell. Did you notice that. Her mother's surname was "Bell".Her father was my 3 gg uncle. His parents were Donald Blue and Margaret Brown who are my 4th great grandparents.
Can you tell me who your grandmother's parents were as I may be able to see a fit with the Marshall family I am now researching. Perhaps there will be similarities of names passed on. Thanks again, Jen