Pine River in 1885 was not very big! According to the Minnesota State Census for 1885 there were 29 total whites with 19 males and 10 females.
6th line down No. 22, Postoffice Brainerd, MN; G. [_] Barclay 45 years, white, born in Maine, parents were not of foreign birth “no”. Under G. Barclay was the name Annetta Barclay, age 38, born in Maine, parents not of foreign birth. Written between the above two persons -[Annetta Barclay] age 3, born in Minnesota.
Source: 1885 Minnesota State Census, FHL#565733, #377, pg. 22, Township 136, Cass County.
I find this entry in this state census very frustrating. I have so little on my grandmother Grace’s origins. Perhaps Amarilla sounds like “Annetta.” The only one that seems to be recognizable is George. The next point is the reference to Maine as their origin? My focus has been on Connecticut for George and his siblings. For Amarilla it has been Iowa. This is the reason that it has been very difficult to figure out where George came from. His age of 45 places the year of birth at 1840 which is four years earlier than I have from other sources.
Some of the other surnames on the page with George are: Woodward, [Kuro or Thuro], Ramport, Fairbanks, Asley, Hunsinger, Dusett, Browne, Morrison, Bannon, Sullivan, and Tallaque/Tallaquais/Gallaquois. (Very hard to read.)
The inhabitants of Pine River in 1885 came from Pennsylvania, Ohio, Minnesota, Maine?, Vermont, Canada, Wisconsin, and Germany.
Many sources state that Amarilla was the only white woman in the Pine River area for years. According to this 1885 census there were other adult women living near her family: Sarah Woodman was 34 and white, Ethel Kuro  and white, Matilda Ashley 23 and white, Amanda Tallaqua  and white, the rest of the women were young girls.
Note: Ancestry.com, The Minnesota Historical Society in St. Paul and the Family History Library all have the Minnesota Territorial and State Census.