Whether the child she bore survived briefly or was stillborn.

The exact duration of her time on the island.

What happened to her after her return to France.

Whether she ever returned to schoolteaching, as some later sources claim.

This last detail — about schoolteaching — appears in some accounts of her later life, suggesting that after her return to France, Marguerite worked as a teacher, possibly in Périgord.

If accurate, it would tell us something about the circumstances in which she found herself after her ordeal: needing to support herself, without the property or social position that her pre-expedition life had offered, and finding a way to do so through a profession that was available to educated women of her time.

But the evidence for this detail is thinner than for the core events of the survival story, and it should be treated with appropriate uncertainty.