On entering the drawing-room she found the whole party at loo, and was immediately invited to join them; but suspecting them to be playing high she declined it, and making her sister the excuse, said she would amuse herself for the short time she could stay below, with a book.

*Scene doesn’t happen in 2005 P&P. Though we do see Lizzie reading, no one acknowledges it except Darcy, by looking at the book in her hand, when he’s talking about his sister.