How not to warn your innocent readers against danger

Last night, after packing some more books, I decided to pull Emma Jane Worboise's Helen Bury; Or, the Errors of My Early Life off the shelf.  This, Worboise's first novel, tells the story of a young woman deluded by love and Tractarianism into becoming a (gulp) Catholic.  Of course, Worboise being staunchly anti-Catholic and all, poor Helen suffers a series of disasters, until finally she returns to Protestantism.  In any event, Helen tells us at one point that her Beloved Young Man, who Seduces Her to the Dark Side (not that he sees it as the dark side, of course, and there are no double-bladed light sabers involved), keeps giving her novels to read like "Sibyl of Rodenhurst." 

Hey! I thought.  Worboise probably wouldn't have singled out a novel by title if it didn't actually exist.  I should go check!

1.  I plug "Sibyl of Rodenhurst" into GoogleBooks.  This yields me...Helen Bury and the Englishwoman's Magazine, the latter of which is either quoting or serializing Helen Bury (there's only a snippet available).  Hrrrrm.

2.  What about "Sybil of Rodenhurst"? No, that doesn't exist either.  But...

3.  There's a Rodenhurst; Or, the Church and the Manor (1845).  Which has a heroine named Sybil!  In which, according to the reviews, the villains are all evil Low Churchmen! A-ha!  (But why is this novel available only in the dreaded snippet view? It was published in 1845! It's out of copyright! Really, it is!)