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.
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: