DeCongé-Watson was born in 1933 in Wickliff, Louisiana as the seventh of nine children of Adina Rodney DeCongé and Alphonse Frank DeCongé. She joined the
Sisters of the Holy Family at age 16, later becoming a sister in the Holy Order of the Sisters of Saint Francis. Between 1952 and 1955, DeCongé taught elementary school in parochial schools in Baton Rouge and Lafayette. She then attended
Seton Hill College where she studied mathematics and French (with minors in English, psychology, and history) and was the second Black student to attend the school. After graduating from Seton Hall in 1959, DeCongé-Watson taught French and math at Holy Ghost School in Opelousas, Louisiana, until 1961. In 1962, DeCongé-Watson received a master's degree in mathematics from
Louisiana State University. She opted to take a break from her studies and teach at DeLisle Junior College in New Orleans from 1963 to 1964. She then started her PhD studies
Tulane University, studying there for one semester. Although delayed by a long illness in the midst of her graduate career, in 1968, DeConge-Watson received her Ph.D. in mathematics and a minor in French from
St. Louis University for her dissertation
2-Normed Lattices and 2-Metric Spaces. ==Career==