DOD is estimation since the last we find her is the 1940 Census. Could not find a Missouri death certificate. Possibility that she died in a Memphis (TN) hospital and thus, no MO Death Certificate.
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Martha E Lancaster in the Arkansas, U.S., County Marriages Index, 1837-1957
Name: Martha E Lancaster
Gender: Female
Age: 18
Birth Year: abt 1872
Residence: Randolph, Arkansas
Spouse's Name: J M Tubbs
Spouse's Gender: Male
Spouse's Age: 32
Spouse's Residence: Oregon, Missouri
Marriage Date: 9 Dec 1890
Marriage License Date: 9 Dec 1890
Marriage County: Randolph
Event Type: Marriage
FHL Film Number: 1293696

Martha E Tubbs in the 1900 United States Federal Census
Name: Martha E Tubbs
[Martha E Trebbe]
Age: 27
Birth Date: Sep 1872
Birthplace: Tennessee, USA
Home in 1900: Kelly, Carter, Missouri
Sheet Number: 1
Number of Dwelling in Order of Visitation: 5
Family Number: 5
Race: White
Gender: Female
Relation to Head of House: Wife
Marital Status: Married
Spouse's Name: Joseph M Tubbs
Marriage Year: 1891
Years Married: 9
Father's Birthplace: Tennessee, USA
Mother's Birthplace: Tennessee, USA
Mother: number of living children: 3
Mother: How many children: 4
Can Read: Yes
Can Write: Yes
Can Speak English: Yes
Neighbors: View others on page
Household Members (Name) Age Relationship
Joseph M Tubbs 44 Head
Martha E Tubbs 27 Wife
Everett Tubbs 21 Son
Mary M Tubbs 7 Daughter
Bessie L Tubbs 4 Daughter
Rozilla Tubbs 1 Daughter

Martha E Tubbs in the 1940 United States Federal Census
Name: Martha E Tubbs
Age: 68
Estimated Birth Year: abt 1872
Gender: Female
Race: White
Birthplace: Tennessee
Marital Status: Widowed
Relation to Head of House: Mother
Home in 1940: Johnson, Carter, Missouri
Map of Home in 1940: Johnson, Carter, Missouri
Inferred Residence in 1935: Rural, Carter, Missouri
Residence in 1935: Rural, Carter, Missouri
Resident on farm in 1935: No
Sheet Number: 11B
Attended School or College: No
Highest Grade Completed: Elementary school, 3rd grade
Weeks Worked in 1939: 0
Income: 0
Income Other Sources: Yes
Neighbors: View others on page
Household Members (Name) Age Relationship
Fred E Tubbs 36 Head
Ruth L Tubbs 25 Wife
Betty E Tubbs 8 Daughter
Raymond E Tubbs 6 Son
George E Tubbs 4 Son
Ella M Tubbs 2 Daughter
Martha E Tubbs 68 Mother