The Oregon Death index lists a spouse named Arnold, but the surname is still Ehrett. Also the 1937 Portland directory lists Melba Ehrett (alterations). No husband is mentioned.
[S3] 1910 Census.
Name: Mebba A Ehrett
Age in 1910: 5
Estimated birth year: abt 1905
Birthplace: Nebraska
Relation to Head of House: Daughter
Father's Name: Joeseph F
Father's Birth Place: Nebraska
Mother's Name: Anna
Mother's Birth Place: Nebraska
Home in 1910: Hastings Ward 4, Adams, Nebraska
Marital Status: Single
Race: White
Gender: Female
[S22] Oregon Death Index, 1903-1998.
Name: Ehrett, Melba
County: Portland
Death Date: 17 Mar 1937
Certificate: 1144
Spouse: Arnold
[S3] 1910 Census.
Name: Joeseph F Ehrett
Age in 1910: 35
Estimated birth year: abt 1875
Birthplace: Nebraska
Relation to Head of House: Head
Father's Birth Place: Missouri
Mother's Birth Place: Indiana
Spouse's name: Anna
Home in 1910: Hastings Ward 4, Adams, Nebraska
Marital Status: Married, 6 years
Race: White
Gender: Male
[S7] 1930 Census.
Name: Arnold C Backstrom
Home in 1930: Portland, Multnomah, Oregon
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Age: 29
Estimated birth year: abt 1901
Birthplace: Michigan
Relation to Head of House: Head
Spouse's name: Melba
Race: White