Alfred Hitchcock Movies

I have been looking for this movie by AH for along time. I don’t know the name but I remember the movie. It was about a little girl who’s uncle would always bring her dolls. It was either the mother or the aunt that would take them from her. She didn’t want the little girl to play with the black girl and one day she was playing with her with her doll and when the Aunt saw her, she chased the little girl away but when she turned around the Aunt found her niece in the box like the doll. Please tell me the name of that movie so that I may purchase a copy.