When the narrator came to return Connie' letter and her the box, she mistook him for her husband Jim, due to memory loss and old age. She thought that Jim had come back home for Christmas. That delusion was Connie' Christmas present.
It was the best Christmas present in the world for her because Jim had written in the letter that he would come home on Christmas. She had read that letter several times every day to feel that he was near her. Now that he was finally there with her, she was extremely happy.
