I've found a lady called Emma Jane Nottle (1885 - 1930)
https://www.wikitree.com/wiki/Nottle-76
Who ran a "Tea/Grocery Shop in the far end Jamaica Cottages"
https://launcestonthen.co.uk/index.p...hes/bolventor/
Could your mystery seller be one of her decedents, or perhaps descended from her neighbour, business competitor, and nemesis, Mrs Couch?
(It's like a Midsomer Murders plot, there's a haunted church further along the road).