Why do we care that she's of tribal descent? Are we now saying tribal American's are exempt from copyright laws? I flatly refuse to redefine native they way the PC crowd does, if you were born in the US you are native. I happen to be of Cherokee linage as well, but that doesn't matter, I'm native because I was born here.
In this case, I personally believe that she was discriminated against by the jury, because she was a Native American. She was tried many many miles from where she lived and worked, and did not have a jury of her peers.