The sources do not generally record her contributions to these cross-cultural translations.

They were her husband’s official role, not hers.

But anyone who has done this kind of work in contexts of high stakes and genuine cultural difference knows that the spouse or family member of an interpreter often contributes substantially to the interpretation — noticing things, commenting privately, providing context that the official translator uses.

The possibility that Marie’s knowledge of Indigenous social contexts, built from a lifetime of experience and not simply from the years of travel with the expedition, contributed directly to the success of specific negotiations and encounters is not established in the sources.

But it is also not implausible, and it deserves acknowledgment even in the absence of direct documentation.