In "The Open Window," how might Saki's short story have been different if it were told from the girl's point of view?

Saki came to the short story genre as a satirist, and he has outdone himself in "The Open Window."  For, by using the third-person narrator, a narrator outside the story, the spontaneous practical joke of the story is played not only upon the unsuspecting Mr. Nuttel, but also upon the reader. With a narrator who is outside the circle of characters, Saki is able to get the readers, who at first laugh at Nuttel's gullibility, to realize that they, too, have been taken in by the tall tale, having had difficulty detecting the truth of a well-told story.

Now, if the story were told from the point of view of Vera, the telling of this fabricated tale would have to be more subjective and the readers might detect its falsity.  Thus, the practical joke upon the reader would be lost.  And, this practical joke upon the readers is what gives Saki's story its uniqueness and value.