what circunstance the author invented this roman

I'm not sure what you mean by "roman". Did you mean why or how she wrote the novel?

yes I mean that

This was a period of a new style in English literature call the modernists. As Sigmund Freud explored theories of consciousness and subconsciousness, Virgina Woolf wrote a novel that focuses not on the events of the external world but on the richness and complexity of mental psyche. Woolf wanted to incorporate highly innovative literary devices to capture the thought process, using in particular stream of consciousness and free indirect discourse, all from a woman's point of view.

thanks!