Unsourced family tree on Ancestry indicates that before her marriage, she was Rose Ledoux.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMT9-59L : accessed 3 January 2022), Rosa Pitre in household of Theodore Pitre, Police Jury Ward 1, St Landry, Louisiana, United States; citing enumeration district (ED) ED 9, sheet 20B, line 91, family 375, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 819; FHL microfilm 2,340,554.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VY5X-RGL : 4 January 2021), Rose Pitre in household of Theodore Pitre, Ward One, St. Landry, Louisiana, United States; citing enumeration district (ED) 49-10, sheet 22A, line 10, family 348, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1451.
Find a Grave, database and images (https://www.findagrave.com : accessed 30 January 2021), memorial page for Rose L Pitre (18 Oct 1909–7 Dec 1991), Find a Grave Memorial no. 183872807, citing Sacred Heart Prairie Ronde Cemetery, Prairie Ronde, St. Landry Parish, Louisiana, USA ; Maintained by Angie Martin (contributor 47902907) .