I realize that the original query is quite old. However, some of the information that was provided to it are inaccurate.
Elie Biron and Elizabeth Rattier dite Raymond were married in 1868, not 1867 (Source: Drouin Collection, 1868, Cathédrale de l'Assomption).
That alone makes it highly unlikely that the Catherine, allegedly born in March 1868 would have been their daughter. Furthermore, given that most French-Canadian children were baptized within a day of their birth, and generally no longer than a week later, one would expect to find a record of the baptism in the records of Ste-Anne-de-Baupré. Yet there is no such record in 1868 at that church.
Although I've seen a few birth records where there have been less than nine months between two children, it's almost incredulous to think that Elizabeth bore two children in a matter of two and a half months. One can confirm the birth of Marie Elmina (Source: Drouin Collection, 1870, Pointe-du-Lac), but there is no entry for Marie Louise in that year at that church.
Zéphise could have possibly been born in Nicolet, but if she had, it is likely that she would have been baptized there. Her baptism is recorded in Trois-Rivières (Source: Drouin Collection, 1872, Cathédrale de l'Assomption).