Black Shawl or Tasina Sapewin was the wife of Crazy Horse, whom she married in 1871. She was a member of the Oglala Lakota and relative of Spotted Tail. Her brother was Red Feather. The elders sent her to heal Crazy Horse after his altercation with No Water. She had a daughter the same year, whose name was They Are Afraid of Her. They Are Afraid of Her died at age three, likely of cholera. Black Shawl also suffered the same disease, and was treated by Dr. Valentine McGillycuddy.

Answer this question: when did they are afraid of her die? Let's think fast. Stream of consciousness:
The important part for answering this question is: They Are Afraid of Her died at age three, likely of cholera. So the final answer is at age three.