Which line from the story foreshadows the trick the niece will play?

"'her great tragedy happened just three years ago,' said the child; 'that would be since your sister's time.'"

'"do you know, sometimes on still, quiet evenings like this, i almost get a creepy feeling that they will all walk in through that window--'"

"'my aunt will be down presently, mr. nuttel,' said a very self-possessed young lady of fifteen; 'in the meantime you must try and put up with me.'"

"'then you know practically nothing about my aunt? ' pursued the self-possessed young lady."