Firehair exhibits a keen eye, a suspicious nature, a fearless attitude in the face of danger and a great deal of drive and determination. Most of the Dakota tribe look to her as a de facto leader in the absence of Chief Tehama.
White Chief of the Pawnee Indians
Apparently Pawnee Bill, who resembles Buffalo Bill, is the "White Chief" in question. I gather he's the star of this book and leads the Pawnee against other savage Indians.
For more on the white savior in Native-themed storytelling, see Dances with Wolves and Avatar.