With Victoria's journals, they are currently a third of their original length. Here's a quote from Dennison, used from a copied extract made during Victoria's life: "I undressed as quickly as possible and then Singer, Peneyvre, Rebecca and Dehler set of for Woolwich. Skerrett and Margaret return to Osborne" Beatrice has written: "Undressed as quickly as possible, the maids having to leave for Woolwich." The close relationship Victoria had with her maids was deleted by Beatrice for posterity.
Furthermore, her destruction was preservation of Victoria's reputation. The queen wrote with vigour, force and confidence, and parts of her journal would have shocked the public and hurt her living relatives, especially material relating to the Kaiser, who was an unreliable friend of England even during the Edwardian period.