That’s really interesting, what programme do you use again? Is there a free resource to check such things?Austen: 128 per 10k words. She's kind of high middle ground.
It's also important to note that not all -ly adverbs are created equal... Austen hits us with one right off the bat in Pride and Prejudice...
"It is a truth universally acknowledged, that a single man in possession of a good fortune must be in want of a wife."
That is not the typical adverb that people are going to bitch about. That's a great opening line, and Austen's narrative voice is so strong she overpowers the adverbs.
Her next -ly is in dialogue and shouldn't be argued with, but could be: "and was so much delighted with it that he agreed with Mr. Morris immediately"
My immediate impression of Austen's work is what I would expect: the -ly adverbs are biased toward dialogue.
Arguably the most famous and well known opening line! And it has an adverb in!