Many thanks rosie99,
I had the birth/death information. The limited biographical information matches the 39 reigster - she lived with her parents in Monmouth. Apparently at some point in WW2 she lived in London and worked in public service for the war effort (relying on my memory here). By '47 she was in Lupton, as the copyright for her final book published that year gave her evidence as Lupton.
Her parents were originally from Hereford and Colwall, and that may be why she ended up there. Didn't find a death notice for the mother.
While mother's death was registered in that Hereford area, I'll check the Monmouth area cemetery registers too (if they exist...).
Are there any aggregated Herefordshire cemetery indexes - an OPC for example?