What is "natawista"

Natawista (c. 1825, Alberta, Canada – March 1893, Stand Off, Alberta, Canada), also known as Natawista Iksana and Madame Culbertson, was an interpreter and diplomat. She was married to Alexander Culbertson, commander of Fort Union. Natawista and Culbertson were first married in Fort Union in 1840, when Natawista was 15 years old and Culbertson was 30 years old. They later participated in a Roman Catholic marriage ceremony in 1858 in Peoria, Illinois.