Where does Virginia appear from in "The Canterville Ghost" by Oscar Wilde?

At the beginning of Chapter Five, Virginia suddenly runs past the tapestry chamber, "the door of which happened to be open," and comes across the Canterville ghost. Virginia has come directly from Brockley Meadow where she has spent the day riding with the Duke of Cheshire, her "curly-haired cavalier." On their way home, however, Virginia came through a hedge and tore her "habit" (skirt) badly. Not wanting her mother to see the damage, Virginia entered the house via the back door and this is how she came to walk past the tapestry chamber and stumble upon the ghost.

This chance encounter with the ghost sets the scene for the story's climax. Face to face with the ghost, Virginia is about to learn the truth of his depression and his desire to enter the Garden of Death - a task he cannot achieve without her help.