Anna M. Mangin died in a hospital in Danbury, Connecticut. Her death marked the end of a life filled with diverse accomplishments as an inventor, educator, and caterer. Her pastry fork invention had a lasting impact on culinary practices, and her community involvement left a positive mark. She was buried in the Mangin family plot in Evergreens Cemetery.

Anna M. Mangin received a patent for her pastry fork invention. This patent marked a significant achievement for Mangin, recognizing her innovative design for a kitchen tool that simplified the process of making pastries and other food preparation tasks. The pastry fork had multiple uses, including beating eggs, thickening food, mashing potatoes, and kneading dough, making it a versatile tool. The patent solidified Mangin's legacy as an inventor and contributed to the advancement of household culinary tools.