Who is Rosa Angelelli from Storming Heaven: A Novel and what is their importance?

Rosa Angelelli is one of the four principle narrators, but her narratives are brief and at times difficult to understand because of their broken language and surreal quality. She seems to blend different times and places together in addition to talking to both living and dead people. Rosa married in Sicily and immigrated with her husband to West Virginia where he found work in the coalmines. Rosa is deeply religious, and she adores her four sons. She is often at odds with her abusive and heavy drinking husband Mario.