I've not read her yet but this article got my attention.
https://www.prospectmagazine.co.uk/culture/70470/gertrude-trevelyan-is-a-novelist-for-the-1930s-and-now-eye-books-boiler-house-press-spiracle
She sounds very interesting, I'd like to read. The theme of someone raising a monkey like a human is something that several scientists have tried (I read a good non fiction book once, Feral Children and Clever Animals) and I'd like to see how she treats it in Appius and Virginia.
I wonder why Virago never revived her? Or Persephone? I suppose they could still do so now, and she sounds worthy of revival.