You did see that post I made regarding how the court regarded the wife of a man to be an American Citizen because her grandfather was an American citizen, which made her father an American citizen, which made HER an American citizen? (And therefore HIM a non-indian from having married her.)
The court specifically ruled that the woman was an American citizen through her descent by her father's father being an American citizen. It even mentions that the "question is to be solved in the same way as if one parent was a citizen of the United States and the other a citizen of a foreign nation."