Mysterious, ambiguous, sensational, ridiculous
The fantasy-prone heroine of Elmer Rice's Dream Girl (1945) is an aspiring novelist and not very successful proprietor of a small bookshop which is lately out of copies of the best-selling bodice-ripper Always Opal, an obvious riff on Kathleen Winsor's Forever Amber: "I was appreciating Opal's hot affair with Monseigneur de Montrouget and you interrupted me just as they were about to—" Alternatives proposed to a disappointed customer do not meet with success. The new Russian novel The Dniepier Goes Rolling Along is equally kidding Mikhail Sholokhov's And Quiet Flows the Don/The Don Flows Home to the Sea, but I have no idea what My Heart Is Like a Trumpet is riffing on. "Mary Myrtle Miven's latest . . . a sort of idyllic love story about two horses. Very tender and poetic." I feel I should be able to detect the joke from the available information, but I got nothing. When the love interest entered the scene with an armload of unwanted ARCs, I was faintly surprised I had never encountered a copy of Fun with a Chafing Dish at a library sale myself.

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Her Wikipedia page doesn't have a complete list of titles, but the fan site has quite a few.
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I have definitely never heard of her! I love the writers this conversation is bringing out of the woodwork.
I like the sound of By Way of the Silverthorns (1941), even though I am sure I would have been allergic to the spirituality. I barely manage Elizabeth Goudge.
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There's a few that are non-spiritual, like The Best Man or Aunt Crete's Emancipation, but they're all very much of their time (period-typical sexism and racism). Though it is fun sometimes to read about an era when small planes were unrestricted and one could take a train almost anywhere.
It's such an interesting puzzle you've found and I hope someday you can find a pointer to the actual book! There must be a bit of trivia hidden somewhere...