This was a really good story, emotional and everything. You're writing is pretty good : ]
one thing that i would like to say though is during this paragraph-
Let’s go to Fifth Avenue and go window shopping and make fun of snobby rich people!” (A/N: sorry, I don’t mean to be mean to the people who do live there, they are probably insane nice people… just for story purposes did I say that.) Sarah exclaimed, a gleam of laughter in her crystal blue Irish eyes. Her aunt laughed, and off they went.
I don't think you should have put the author's note there. I think it ruins the flow a little. I would have waited to put that in the actual author's note place instead of there.