Laura appears to have died between 1880 & 1884.

1900 Census Coosawhatchie, Hampton Co., SC
Calvin Lawton Head B M b. Nov 1839 age 60 married 16 yrs b. SC Father SC Mother SC
Ella Lawton Wife B F b. Oct 1865 age 34 married 16 yrs 9 children born 7 living b. SC Father SC Mother SC
Leonora Lawton Daughter b. Aug 1882
Jonathan Lawton Son b. Aug 1886
Alberta Lawton Daughter b. Aug 1890
Justina Lawton Daughter b. March 1894
Joseph Lawton Son b. Feb 1896
George Lawton Son b. Apr 1898
Virginia Lawton b. Oct 1899