It would appear from many records on familysearch.org, some shown here, that she may have been born in Polk Cty, TN rather than MO.
Illinois, Deaths and Stillbirths
Laura Mae Thomas
death: 07 Sep 1938 Tuscola, Douglas, IL
Female 20 y
birth 03 Jan 1918 Newman, IL
father: Luther Sanderson birth Polk Co, MO
mother: Nettie Hendrich birth Weakley Co, TN
Catherina Sanderson
death 25 Jan 1920 Young America, Edgar Co, IL
birth 13 Jan 1920 IL
father: Luther Sanderson birth MO
mother: Nettie Hendricks birth TN
Kenneth Sanderson
death 13 Jan 1920 Young America, Edgar Co, IL
birth 13 Jan 1920 IL
father: Luther Mccullock Sanderson birth MO
mother: Nettie Hendricks birth TN
U S Census, 1920 Young America Precinct 1, Edgar, IL
self Luther Sanderson M 35y MO
wife Nettie Sanderson F 25y TN
son John Sanderson M 5y IN
son Davie Sanderson M 4y9m IL
dau Laura May Sanderson F 1y11m IL
bro Jesse Sanderson M 19y MO