Reading progress update: I've read 62%.

Bitch In a Bonnet: Reclaiming Jane Austen From the Stiffs, the Snobs, the Simps and the Saps (Volume 2) - Robert Rodi

From page 230, Northanger Abbey section:

Basically, Catherine is naive or savvy, depending on what a given scene requires her to be. That this doesn't jar more is a credit to Austen's gifts; it's also due to our willingness to keep this baby chugging along, because we're sure as hell enjoying the ride.