Final answer:
Elizabeth is referring to Abigail Williams when she says "She wants me dead, John, you know it!", as she believes Abigail is targeting her to rekindle an affair with John Proctor in 'The Crucible'.
Step-by-step explanation:
In the quote "She wants me dead, John, you know it!" from the scene in question, Elizabeth is referring to Abigail Williams. Elizabeth Proctor believes that Abigail, who previously had an affair with her husband, John Proctor, is now trying to get Elizabeth convicted of witchcraft so that she can marry John. This intricate plot is a central part of Arthur Miller's play, The Crucible, which explores the Salem witch trials and the hysteria that engulfed the community.