Fanny Burney's book entitled “Diary and Letters of Madame D'Arblay” is considered in terms of lexical analysis in the present paper. Fanny Burney (1752-1840) is a Romanticism novelist who depicted her contemporaries' life before and after the Revolutionary turbulent epoch. Her diaries witnessed her happiness and woes and may assist in her novel narrative or style understanding. The words frequency analysis shows the prevailing subjects she was interested in, locations she mostly stayed at, the society she was surrounded by, and the way of life allowing to outpour the talent for observation onto the novel pages. Her diary allows to outline the major novel narrative techniques she practised on its pages and exploited in the novels. Fanny Burney preserved the epoch in her works and contributed to Romanticism novel development.