Margaret Emma Lucas born in Kansas

Has anyone come upon a Margaret Emma Lucas born in Kansas probably 1865-1880? She later married and lived in south Dakota with her husband Joseph M James. James is the surname. My ancestor Robert m James was their son born in SD in 1893 and he attended Indian schools until his mother died around 1900.
The family history is that his mother had Indian heritage. I have had DNA autosomal tests that show a NA %.