While reading a book, Miss Bingley said, "... there is no enjoyment in like reading!" But there was evidence to show that she was not enjoying her reading at all. What was the evidence?

Miss Bingley is not reading, but rather watching Darcy and looking for a way to induce conversation.

Miss Bingley's attention was quite as much engaged in watching Mr. Darcy's progress through his book, as in reading her own; and she was perpetually either making some inquiry, or looking at his page. She could not win him, however, to any conversation; he merely answered her question, and read on. At length, quite exhausted by the attempt to be amused with her own book, which she had only chosen because it was the second volume of his, she gave a great yawn and said, "How pleasant it is to spend an evening in this way! I declare after all there is no enjoyment like reading! How much sooner one tires of anything than of a book! When I have a house of my own, I shall be miserable if I have not an excellent library."