Final answer:
The question does not provide enough context to know how the Marquise de Sain-Meran died. If the character is from 'The Count of Monte Cristo', she was poisoned by Madame Villefort.
Step-by-step explanation:
The inquiry about how the Marquise de Sain-Meran died appears to be related to a literary reference rather than a historical event. In the realm of literature, deaths are often a critical plot point that can have thematic significance or drive the story forward.
The provided context does not specify a particular narrative or author that mentions the Marquise de Sain-Meran, so it is not possible to give a definitive answer about her demise. It's important to ensure the source of the inquiry to provide an accurate answer in the field of English or literature study.
In case the question refers to a character from Alexandre Dumas' 'The Count of Monte Cristo', then the Marquise de Saint-Méran's death was caused by poisoning. She was the grandmother of Valentine de Villefort and victim of the villainous Madame Villefort, who used poison to claim the family's wealth.
The Marquise de Sain-Meran, mentioned in Alexandre Dumas' novel The Count of Monte Cristo, dies by poisoning. She is given poison disguised as a medicine by Villefort, who is trying to conceal a secret. The poison causes her to die a painful death.