I just came across this by chance (to be published in May 2022) it looks like suitable reading for us:
The Australian novelist and playwright Helen de Guerry Simpson (1897-1940) published many supernatural short stories. This new edition selects the best of her unsettling writing, adding some little-known stories to her 1925 collection The Baseless Fabric. Featured stories include:
'An Experiment of the Dead', in which a visitor comes to visit a woman in the condemned cell. 'Good Company', in which a traveller in Italy becomes temporarily possessed of a hitchhiker in her mind. 'Grey Sand and White Sand' is the horrifying story of a landscape artist who sees and paints a different view. 'The Outcast', in which a soldier left for dead in the War takes his revenge on his village. 'The Rite', in which a discontented woman enters a wood, and emerges transformed. Helen de Guerry Simpson was born in Sydney, New South Wales, and studied at Oxford. Her novel Boomerang won the James Tait Black Memorial Prize for 1932. She died from cancer in 1940. Her close friend, the novelist Margaret Kennedy, took charge of Simpson's daughter Clemence during the war while Simpson was in her last illness. Clemence and Simpson both feature in Kennedy's wartime memoir, Where Stands A Winged Sentry, also published by Handheld Press.
Available for pre-order at Foyles & The Book Depository, as far as I can find. If you have $1k to spare, you can get a copy of her book "The Baseless Fabric" while you wait for this one.
As well as having two of her own books filmed by Hitchcock, she also worked on the dialogue for Hichcock's Sabotage (1936) - a pretty decent film, loosely based on Joseph Conrad's The Secret Agent. the.hitchcock.zone/wiki/Helen_Simpson