I think JA recognized not only was it the winners who wrote history, these winners tended to be men.
Perhaps why her History has so many references to women usally in a sympathtic view; Elizabeth Woodville, Jane Shore, Anna Bullen, Elizabeth of York 'by which alliance he plainly proved that he thought his own right inferior to hers'.

She refuses to be bound in her prejudices to provide any proof for the reader of guilt or innocence of e.g Richard the 3rd.