I believe you have the death certificate for the wrong Celine David. Yes Celine David's mother was Aspassie David and her father was Pierre Simon David but I believe THAT Celine David was married as late as 1858 to Gustave Robic/Roubique. Aspassie's daughter Celine married Robic in 1846 and their son Blanchard was born in 1858.
The Celine David that married Bueche was having children with him in 1854 at least.
Not sure who the Celine David is that did marry Bueche, but I am pretty sure it wasnt Aspassie's daughter.
What do you think?