Could this be your grandmother, Olga?

1930 Census Beat 2, Simpson Co., MS
Arthur Walker Head M Neg 36 married at age 21 b. MS Father MS Mother MS Occu: Farmer General Farm
Ida Walker Wife F neg 34 married at age 19 b. MS Father MS Mother MS
Josephine Walker Daughter F Neg 14 single b. MS Father MS Mother MS
Irine? Walker Daughter F Neg 12 single b. MS Father MS Mother MS
Nasthis (Nasthie? Noothie?) Walker Daughter F Neg 10 single b. MS Father MS Mother MS
James Walker Son M Neg 8 single b. MS Father MS Mother MS
Olga Walker Daughter F Neg 6 single b. MS Father MS Mother MS
Docia Walker Daughter F Neg 4 single b. MS Father MS Mother MS
Ola Walker Daughter F Neg 1yr 4?mon single b. MS Father MS Mother MS