Sentence:  The dead daughter presents the already complex mother/daughter relation and unveils in it the (abject?) desire to <WSD>unmother</WSD>: in Beloved, the killing of the daughter is done to free her from a future of slavery, and in this it discloses another story, 
Meaning of the word marked with <WSD> tags:  To cause to cease being a mother; to kill or otherwise remove (a mother's) children.