Conversation so far:
who is lyra's mother in the golden compass
Mrs Coulter, an influential woman who takes an interest in Lyra, later admits that she is Lyra's mother in The Golden Compass.
Who is the actress that plays Lyra's mother in the Golden Compass
Nicole Kidman plays Mrs Coulter, Lyra's mother, in The Golden Compass
Does Mrs Coulter die in the Golden Compass
Mrs Coulter dies the third novel, The Amber Spyglass, which is the third novel of the His Dark Materials trilogy

Question: How does the character die
Self-contained rewrite: How does Mrs Coulter die in The Amber Spyglass