In 1900 she was still living at home with her family in St. Tammany Parish.  She was married to Edgar Brown in 1906.. The St. Tammany Farmer writes:
The bridge looked very fair and sweet in a frock of pineapple tissue, trimmed with lace. She also wore a coronet of orange blossoms… The groom, Mr. Edgar B. Brown, is a popular young man of New Orleans, well known in banking circles. 
According to family history, she had a child that died in infancy, and "Mother always felt she grieved herself into a fatal illness." Legend has it that her husband had tuberculosis, which she then contracted, as did her child.
By 1910 she has returned home a widow, living with the Yates family in Township 5 Ward 2 Folsom Precinct. 
↑ 1.01.1 "United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDXJ-DLZ : 14 July 2016), Sarah Jane Yates in household of John M Yates, Sandy Ford, St Tammany, Louisiana, United States; citing enumeration district ED 174, sheet 362D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0471; FHL microfilm 1,254,471.
↑ 2.02.1 >Year: 1900; Census Place: Police Jury Ward 2, Saint Tammany, Louisiana; Roll: 583; Page: 8A; Enumeration District: 0079; FHL microfilm: 1240583 Description Enumeration District : 0079; Description: Ward 1 including Madisonville Town Source Information Ancestry.com. 1900 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2004. Original data: United States of America, Bureau of the Census. Twelfth Census of the United States, 1900. Washington, D.C.: National Archives and Records Administration, 1900. T623, 1854 rolls.
↑ 5.05.1 Notes by family historian Juanita Gayer, given to Boone Yates Richardson, and uploaded here.
↑ 6.06.1 Year: 1910; Census Place: Folsom, Saint Tammany, Louisiana; Roll: T624_531; Page: 8B; Enumeration District: 0093; FHL microfilm: 1374544 Ancestry.com. 1910 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2006. Original data: Thirteenth Census of the United States, 1910 (NARA microfilm publication T624, 1,178 rolls). Records of the Bureau of the Census, Record Group 29. National Archives, Washington, D.C.
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It may be possible to confirm family relationships with Catherine by comparing test results with other carriers of her ancestors' mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Catherine: