Final answer:
The cause of Leonora's mother's death is not explicitly mentioned in the texts. The various excerpts deal with the theme of death, ranging from illness, self-inflicted wounds, to consequences of poverty and exile.
Step-by-step explanation:
The death of Leonora's mother is not specifically described in the provided texts. However, various pieces touch upon themes of death and loss. Margaret Matilda Odell, in her memoir of a poet, speaks of the poet's obsession with death, linking it to her African heritage and the loss of her mother's presence. Another excerpt describes a self-inflicted death due to lament over a son. In yet another, we read about Lady Madeline's death due to a mysterious illness that perplexed her physicians. A passage from LibreTexts shares a tragic story of a mother who died from an embolism post-delivery, and a legal case where the poverty of Theodora contributed to her daughter's demise. Lastly, the story from Heliodorus tells of a prophecy fulfilled when a woman dies due to an accidental self-inflicted wound while in a frenzied state.