Who is Agnes Tsosie from Talking God and what is their importance?

Agnes Tsosie is the old Woman Tsosie is matriarch of the Bitter Water Dinee, the same Navajo clan claimed by Henry Highhawk. Among her accomplishments, she has served on the Navajo Tribal Council twice and been instrumental in getting wells drilled so that water is available at every Chapter House. Her photo was included in a National Geographic story about the Navajo.