I have just come upon this and I hardly know what to make of it other than that we need to investigate! Joshua this (transcendentalism) is definitely your department, and Don we need your help too, since the book is clearly out of copyright but I cannot find a full PDF to download.
The title of my post is not mere sensationalism - it appears that this woman decided to directly respond to Frances Wright's "A Few Days in Athens" with a novel taking Plato's side! If so very perceptive to have arrayed Plato against Epicurus rather than the Stoics.
Take a look at this (I can't figure out the etching -- unless "Lydia Maria" is a man! - in which case I will have to revise the title....