I am pleased to report that it does indeed still exist, though it has not weathered the years well. Printed in 1757, the book remained with the queen during her incarceration and as she waited for the sun to rise on the day of her death, the condemned woman penned a few final, pitiful lines in the small book book.
"My God, have pity on me! My eyes have no more tears to cry for you my poor children; adieu! adieu!"
The book was later claimed by Robespierre and after his death was found tucked in with his private papers and concealed beneath a a hidden compartment in his bedchamber, a personal keepsake of the end of the monarchy.
Life in the Georgian Court, true tales of 18th century royalty, is available at the links below.
Book Depository (free worldwide shipping)