Mary Amelia Ingalls (January 10, 1865 – October 20, 1928) was born near the town of Pepin, Wisconsin. She was the first child of Caroline and Charles Ingalls. She was the older sister of author Laura Ingalls Wilder, who was best known for her Little House on the Prairie book series.
At the age of 14, Ingalls suffered an illness described as "a severe case of measles", which was scarlet fever, and a stroke in her sister's unpublished memoir, Pioneer Girl, which resulted in lifelong blindness. Between 1881 and 1889, she attended the Iowa College for the Blind at Vinton, Iowa.
There was one year in that interim when she did not attend the school, and the historical record is silent as to why, but she did finish the seven year course of study in 1889 and graduated. Then she returned home to De Smet, South Dakota and lived with her parents until their deaths. There she was able to contribute to the family income by making fly nets for horses. Later, she lived with her sister, Grace, and then Carrie. She died on October 20, 1928 at the age of 63, as a result of pneumonia and complications from a stroke. She is buried at De Smet Cemetery.