Correction from my last posting. At the end, I meant to write Joseph Cormier rather than Joseph Doucet. Sorry.
I may have found something on Elise Credeur. It's been tough going! I had mentioned that I found an Edmond Credeur [bn ca 1870] who had a daughter named Liza [age 2 in 1910]. I thought she might be your Elise. However, I now see that she had a sister, Elle or Ella, who was two years older, born ca 1906. On the 1930 census, Elise's year of birth is ca 1907 and in 1940, it is ca 1906. What I found next is amazing. I found the same family in 1920 and Edmond's last name is spelled "Cruthers". Remember that I found a marriage record for a Joseph Cormier and an Elice Coruthers in 1921. Why would he have changed his name?
I found a death record for an Edmond Credeur who died 11/21/1955 in Acadia Parish at age 85. That would make him having been born in 1870.
In 1910, Edmond Credeur's wife is named Oliva and by 1920, he is a widower. There seemed to be as many as 13 children.