Emma Taylor was on of seven children of John G. W. Taylor and Marinda Hiner Taylor.
She first married Harry Raybourn (not sure of spelling) on October 10, 1906; then, Carl David McMahan on June 12, 1912, Lee County, Iowa; they divorced before 1940 and later married Otho Baines Crow before 1940.
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Iowa, County Marriages, 1838-1934

Name: Carl Mcmahan
Titles and Terms:
Event Type: Marriage
Event Date: 06 Jun 1912
Event Place: Lee, Iowa, United States
Age: 27
Birth Year (Estimated):
Birthplace:
Father's Name: Homer Mcmahan
Father's Titles and Terms:
Mother's Name: Eva Knox
Mother's Titles and Terms:
Spouse's Name: Emma Taylor
Spouse's Titles and Terms:
Spouse's Age: 27
Spouse's Birth Year (Estimated): 1885
Spouse's Birthplace:
Spouse's Father's Name: John Taylor
Spouse's Father's Titles and Terms:
Spouse's Mother's Name: Marinda Hiner
Spouse's Mother's Titles and Terms:
Reference ID:
GS Film Number: 1871418
Digital Folder Number: 004322400
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1920 census

Carl Mcmahan Head M 35 Illinois
Emma Mcmahan Wife F 35 Illinois
Alberta Mcmahan Daughter F 12 Illinois
Nellie Mcmahan Daughter F 6 Illinois

Assuming, Alberts was a daughter by a previous marriage of Carl's - not sure
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1930 census

Emma Mcmahan Head F 40 Illinois
Nellie Mcmahan Daughter F 17 Illinois

Note: husband, Carl, was not in household.
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Carl was listed as divorced and Emma was with Otho Crow in In 1940 census:

Otho Crowe Head M 50 Missouri
Emma Crowe Wife F 50 Illinois
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Otho was prior married to Etta Jane Murray; she died Feb. 19, 1920 and buried with him in Missouri - they were parents of 5 children, Pauline, Clarence, John, Gussie and Shirley.
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United States Social Security Death Index

Given Name: Emma
Middle Name:
Surname: Crow
Name Suffix:
Birth Date: 21 Nov 1884
State: Illinois
Last Place of Residence: Warsaw, Hancock, Illinois
Previous Residence Postal Code: 62379
Event Date: Jul 1967
Age: 83

Note: Emma's age in census is younger than she was.