Another Question

Another thing I don't get in the book is the whole argument about Compeyson's wife. On page 348, Compeyson, or Abel Magwitch, I can't really tell which one, said "Compeyson's wife and me took him up to bed agen, and he raved most dreadful. 'Why look ay her!' he cries out. 'She's a-shaking the shroud at me! Don't you see her? Look at her eyes! Ain't it awful to see her so mad?' Next, he cries, 'She'll pit it on me, and then I'm done for! Take it away from her, take it away!' And he catched hold of us, and kep on a-talking to her, and answering of her, till I half-believed I see her myself." So, my question is what is it about Compeyson's wife that drives the convict crazy? Also, I'm pretty sure she's dead, because he says, 'I half-believed I see her myself' which means he does not see her very often or at all, so either she has died or is some secluded creature. What is it about her mad eyes that scares the convict?