Native American DNA does not always show up when you are dealing with as many generations back as Mary Hyano. I am a descendant through my father but he didnt have any NA ancestry either. On my moms side I have at least 12 NA going back hundreds of years in Quebec. My mom is the oldest of eleven and about half of them have NA DNA trace. So not having NA DNA show up in a DNA test does not mean you dont have a Native American ancestor generations back.