Question: What Lakota Tribe Reservation was Dolly Akers affiliated with?

Context paragraphs:
Gall (Phizi): Gall (Lakota: Phizi ) (in Standard Lakota Orthography) (c. 1840 – December 5, 1894) was a warchief of the Hunkpapa Lakota tribe of Native Americans.  He was among the Lakota leaders who defeated Lieutenant Colonel George Armstrong Custer and the 7th Cavalry Regiment at the Battle of Little Big Horn in 1876.

Fort Peck Indian Reservation: The Fort Peck Indian Reservation is near Fort Peck, Montana, in the northeast part of the state.  It is the homeland of federally recognized bands of Assiniboine and Sioux tribes of Native Americans. (The Sioux, also known as Lakota and Dakota, have several other reservations, including in North Dakota and South Dakota.)

Rita Long Visitor Holy Dance: Rita Long Visitor Holy Dance is a Native American spiritual elder who is a member of the Oglala Lakota Tribe and comes from the Pine Ridge Reservation in South Dakota.  Through her work as an indigenous elder stateswoman, Rita has gained international recognition through her work as part of the International Council of 13 Indigenous Grandmothers - a group of spiritual elders, medicine women and wisdom keepers since its founding in 2004.

Dolly Akers: Dolly Akers or Dolly Smith Cusker Akers (March 23, 1901 – June 5, 1986) was an Assiniboine woman who was the first Native American elected to the Montana Legislature and first woman elected to the Tribal Executive Board of the Assiniboine and Sioux Tribes on the Fort Peck Indian Reservation.

Hunkpapa: The Hunkpapa (Lakota: Húŋkpapȟa) are a Native American group, one of the seven council fires of the Lakota tribe.  The name "Húŋkpapȟa" is a Lakota word meaning "Head of the Circle".  (At one time, the tribe's name was represented in European-American records as "Honkpapa".)  By tradition, the Húŋkpapȟa set up their lodges at the entryway to the circle of the Great Council when the Sioux met in convocation.  They speak Lakȟóta, one of the three dialects of the Sioux language.

Many Horses: Many Horses was a holy man of the Oglala Lakota tribe.  He was a friend of Sitting Bull and a believer in the Ghost Dance.  In the spring of 1890, he organized a Ghost Dance ritual at Standing Rock Reservation to drive away the white soldiers camped nearby, but was distressed to see that they were still there at dawn the next day.  He then said to the assembled people:

Lower Brule Indian Reservation: The Lower Brulé Indian Reservation is an Indian reservation that belongs to the Lower Brulé Lakota Tribe.  It is located on the west bank of the Missouri River in Lyman and Stanley Counties in central South Dakota in the United States.  It is adjacent to the Crow Creek Indian Reservation on the east bank of the river.  The "Kul Wicasa Oyate" (lower…men…nation), the Lower Brulé Sioux, are members of the Sicangu (Burnt Thigh), one of the bands of the Lakota Tribe.  Tribal headquarters is in Lower Brule.

Rain-in-the-Face: Rain-in-the-Face (Lakota: Ité Omáǧažu )(in Standard Lakota Orthography) (c. 1835 – September 15, 1905) was a warchief of the Lakota tribe of Native Americans.  His mother was a Dakota related to the band of famous Chief Inkpaduta.  He was among the Indian leaders who defeated George Armstrong Custer and the U.S. 7th Cavalry Regiment at the 1876 Battle of Little Big Horn.

Beatrice Long Visitor Holy Dance: Beatrice Long Visitor Holy Dance is a Native American spiritual elder who is a member of the Oglala Lakota Tribe and comes from the Pine Ridge Reservation in South Dakota.  Beatrice has gained international recognition through her work with the Council of the International Council of 13 Indigenous Grandmothers - a group of women elders, medicine women and wisdom keepers founded in 2004.

Oglala Lakota: The Oglala Lakota or Oglala Sioux (pronounced ] , meaning "to scatter one's own" in Lakota language) are one of the seven subtribes of the Lakota people who, along with the Dakota, make up the Great Sioux Nation.  A majority of the Oglala live on the Pine Ridge Indian Reservation in South Dakota, the eighth-largest Native American reservation in the United States.  The Oglala are a federally recognized tribe whose official title is the Oglala Sioux Tribe (previously called the Oglala Sioux Tribe of the Pine Ridge Reservation, South Dakota).  Of note, however, some Oglala reject the term "Sioux" because it was a name give to them by the Chippewa Nation, who were historically enemies of the Lakota.  The term means "snake" and, as such, is seen as a slur.

Supporting paragraphs: Dolly Akers Fort Peck Indian Reservation
Answer: Fort Peck Indian Reservation