Mmmm...I wonder if the relative may have mis-remembered the details of the meeting/story?
This is very likely a red herring, however stranger things have happened so I will post. In 1985, a Wishaw newspaper carried a story about a former Shottsonian, as they put it (ie someone from Shotts), who was on holiday in the area. Unfortunately no age mentioned.
Anyhow, she was a nun, Sister Mary Bernadette (Jane Burns), who left Shotts in 1933. She was in the Order of the Poor Clare's who were based in NI. She seems to have taught in a number of locations, mainly in Newry though.
The Sister was visiting from Newry and a Mass/celebration was being held for her 50 years teaching service. A Burns nephew (James Burns), was involved in same.
If nothing else, worth a check even if only to rule it out.