AIM was Wounded Knee in 1973.
In fact Wounded Knee was about a corrupt Tribal leader that they felt the BIA (Bossing Indians Around) was protecting.
Those were not considered part of the Indian Wars as they were not between the US military or US civilians and American Indians.
Take it up with the historians.
1896 is still way too late to base a movie with her as a survivor of an indian attack and he's a soldier who's seen too much.