Who is Rita Speight from She's Come Undone and what is their importance?

Rita Speight is Jack's wife. She lived in the upstairs apartment of Grandma Holland's house. Rita told Grandma and Bernice that she was pregnant just days before her miscarriage. There's no indication that Rita knew that her husband had raped Dolores. Dolores blames herself for the death of the child, somehow connecting that to what she and Jack did—almost as if she believes that she was also responsible for the rape.