What thoughts haunt Mariam after the loss of her child?

From the text:

Mariam grieved for this baby, this particular child, who had made her so happy for a while. Some days, she believed that the baby had been an undeserved blessing, that she was being punished for what she had done to Nana. Wasn't it true that she might as well have slipped that noose around her mother's neck herself? Treacherous daughters did not deserve to be mothers, and this was just punishment- She had fitful dreams, of Nma'sjinn sneaking into her room at night, burrowing its claws into her womb, and stealing her baby. In these dreams, Nana cackled with delight and vindication.