Can anyone tell me if the Shirley Underhill listed in the 1930 census (as follows) is in fact the same Katheryn Shirley Underhill who married Wilford Morrison in 1939, Butte Co., SD?

UNDERHILL, John E, Head, 47, NE, NE, IL
UNDERHILL, Emma, Wife, 46, NE, NE, IO
UNDERHILL, John, Son, 22, SD, NE, NE
UNDERHILL, Lauretta, Dau, 20, SD, NE, NE
UNDERHILL, Frank, Son, 16, SD, NE, NE
UNDERHILL, Avis, Dau, 15, SD NE, NE
UNDERHILL, Vera, Dau, 18, SD, NE, NE
UNDERHILL, Harry, Son, 12, SD, NE, NE
UNDERHILL, SHIRLEY, Dau, 10, SD, NE, NE
UNDERHILL, Donald, Son, 7, SD, NE, NE
UNDERHILL, Margaret, Dau, 6, SD, NE, NE
UNDERHILL, Louise, Dau, 4, SD, NE, NE
(spearfish, lawrence co., SD)

What was Emma, the mother's maiden name?