There are 2 died that day but this fits the bill:

Name: Sylvia M Yonce
Social Security #: 549124393
Sex: Female
Birth Date: 6 Oct 1888
Birthplace: Kansas
Death Date: 18 Feb 1973
Death Place: Yuba


Name: Sylvia Yonce
SSN: 561-21-1833
Last Residence: 95901 Marysville, Yuba, California, United States of America
Born: 6 Oct 1888
Died: Feb 1973
State (Year) SSN issued: California (1973)

BURIED IN
Sierra View Memorial Park
Olivehurst
Yuba County
California

WITH HUSBAND

John Walcie "Walcie" Yonce
Birth: Jul. 22, 1894
Claiborne County
Tennessee, USA
Death: Feb. 8, 1961
Marysville
Yuba County
California, USA


CHILDREN
Mildred Yonce Chance (1915 - 2001)
Ruby May Yonce StClair (1918 - 2008)