Hi David (Selig)

For the time in question you have too look at the tables annuelles rather than the tables decennales.
Because there are no tables decennales for this years, but only tables annuelles.
The tables annuelles and decennales say in which part of Paris and when the marriage took place.
With this details it's easy to find the actual marriage record.

You metionned a residence card in Mannheim from where Martha emigrated.
Does it say if she was married or not and to whom she was married?
You also say she was born 26.11.1897, Bad Mergentheim, Germany.
Do you have the records of Bad Mergentheim? They are available online:

https://www2.landesarchiv-bw.de/ofs21/olf/struktur.php?bestand=5632

Regards
Corinne ITEN