Spitz invented the first practical machine for shelling
pine nuts in bulk. She traveled to study nut processing methods, and spent months as an apprentice in a machine shop, before she built a prototype of her original design in her basement workshop. She was granted a patent for the "Method and Apparatus for Shelling Nuts" in 1918. She also sold pine nuts from her Albuquerque farm, and promoted their nutritional value and culinary possibilities. She also exhibited the machine at a national convention of confectioners in 1922, in Chicago. She also experimented with using the machine for processing
coffee beans.
The Albuquerque Journal declared her "the greatest known authority on the pinon nut and its possibilities". In October 1923, she announced that she was retiring and seeking buyers to take over her business. ==Personal life and legacy==