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LeBreton joined the NSU faculty at the age of twenty-seven in 1963 as an instructor of social science. She was promoted to assistant professor of history in 1965, associate professor in 1970, and full professor in 1973. In 1980, she was named to succeed Donald Moses Rawson (1925-2014) as chairman of the NSU Department of History after president René Joseph Bienvenu, Jr. (1923-1983 tapped Rawson as the Dean of the Graduate School.<ref>{{cite web|url=http://www.jstor.org/discover/10.2307/2207102?uid=3739920&uid=2129&uid=2134&uid=2485183163&uid=2485183153&uid=2&uid=70&uid=3&uid=3739256&uid=60&sid=21104955297203|title=Historical News and Notices|page=156|publisher=jstor.org: ''The Journal of Southern History'', Vol. 47 (No. 1)|date=February 1981|accessdate=October 18, 2014}}</ref> LeBreton left the chairmanship in 1983, when the department was renamed Social Sciences. She returned to teaching and was still on the history faculty in the spring of 2009 when she was stricken with a brief but fatal illness.  

LeBreton joined the NSU faculty at the age of twenty-seven in 1963 as an instructor of social science. She was promoted to assistant professor of history in 1965, associate professor in 1970, and full professor in 1973. In 1980, she was named to succeed Donald Moses Rawson (1925-2014) as chairman of the NSU Department of History after president René Joseph Bienvenu, Jr. (1923-1983 tapped Rawson as the Dean of the Graduate School.<ref>{{cite web|url=http://www.jstor.org/discover/10.2307/2207102?uid=3739920&uid=2129&uid=2134&uid=2485183163&uid=2485183153&uid=2&uid=70&uid=3&uid=3739256&uid=60&sid=21104955297203|title=Historical News and Notices|page=156|publisher=jstor.org: ''The Journal of Southern History'', Vol. 47 (No. 1)|date=February 1981|accessdate=October 18, 2014}}</ref> LeBreton left the chairmanship in 1983, when the department was renamed Social Sciences. She returned to teaching and was still on the history faculty in the spring of 2009 when she was stricken with a brief but fatal illness.  

She authored ''Northwestern State University: A History 1884-1984,''<ref>{{cite book|url=http://openlibrary.org/b/OL2555618M/Northwestern_State_University_of_Louisiana__1884-1984|title=Northwestern State University of Louisiana, 1884-1984: A History|publisher=openlibrary.org|accessdate=October 5, 2009}}</ref> which was published in 1985 by the NSU Press for the university centennial.<ref name=author>{{cite web|url=http://northwesternalumni.com/s/859/images/FileLibrary/dec14401-49cc-4210-9014-8f8462345151.pdf|title=Author of NSU History Dies|publisher=northwesternalumni.com|accessdate=October 5, 2009}}</ref>​

She authored ''Northwestern State University: A History 1884-1984,''<ref>{{cite book|url=http://openlibrary.org/b/OL2555618M/Northwestern_State_University_of_Louisiana__1884-1984|title=Northwestern State University of Louisiana, 1884-1984: A History|publisher=openlibrary.org|accessdate=October 5, 2009}}</ref> which was published in 1985 by the NSU Press for the university centennial.<ref name=author>{{cite web|url=http://northwesternalumni.com/s/859/images/FileLibrary/dec14401-49cc-4210-9014-8f8462345151.pdf|title=Author of NSU History Dies|publisher=northwesternalumni.com|accessdate=October 5, 2009; no longer on-line}}</ref>​

LeBreton authored "The Acadians" chapter of Stephan Thernstrom's ''Harvard Encyclopedia of American Ethnic Groups.'' She also wrote a geographic and historical article about [[Dorcheat Bayou]], a scenic wonder  in southwestern [[Arkansas]] and Webster Parish, Louisiana, in the book ''Rivers and Bayous of Louisiana." She wrote "The Burr Conspiracy", a chapter of the ''Readings in Louisiana History," of which she was also the associate editor.<ref name=author/>​ In 1974, LeBreton wrote a position paper on Article III of the Louisiana Constitution of 1812 entitled "[[Edwin Edwards]]: The Role of the Governor in Louisiana Politics: An Historical Analysis," which was published in the periodical, ''Louisiana History,'' based at the University of Louisiana at [[Lafayette]].<ref name=royal/>​

LeBreton authored "The Acadians" chapter of Stephan Thernstrom's ''Harvard Encyclopedia of American Ethnic Groups.'' She also wrote a geographic and historical article about [[Dorcheat Bayou]], a scenic wonder  in southwestern [[Arkansas]] and Webster Parish, Louisiana, in the book ''Rivers and Bayous of Louisiana." She wrote "The Burr Conspiracy", a chapter of the ''Readings in Louisiana History," of which she was also the associate editor.<ref name=author/>​ In 1974, LeBreton wrote a position paper on Article III of the Louisiana Constitution of 1812 entitled "[[Edwin Edwards]]: The Role of the Governor in Louisiana Politics: An Historical Analysis," which was published in the periodical, ''Louisiana History,'' based at the University of Louisiana at [[Lafayette]].<ref name=royal/>​