What makes it easy for Vera to fool Mr. Framton Nuttel in "The Open Window"?

Another
thing that makes it easy for Vera to fool Framton Nuttel with her ghost story is the fact that
the whole family leads such a monotonous, routine existence. Vera knows in advance exactly what
her aunt is going to say about the open window and exactly when the three hunters will return
for tea. She even knows that Bertie will be singing the same song, with the refrain:

"I said, Bertie, why do you bound?"

It is because of the monotony of her own existence that this
bright, imaginative fifteen-year-old girl decides to inject a little diversion and humor into
her dull family.

Vera also finds it easy to fool Framton Nuttel because she
has such a vivid imagination. She can invent the wildest stories spontaneously and make them
entirely convincing. She may have been toying with the plot for her ghost...