Who is Mrs. Grossman from Bee Season: A Novel and what is their importance?

Mrs. Grossman-Naumann is Saul Naumann's wife. The couple has two children, Eliza and Aaron. Miriam was an only child, and her wealthy parents were both killed by an automobile while they were out walking. Miriam is described as an obsessive-compulsive kleptomaniac and a rabid perfectionist. She also finds it difficult to form deep attachments to other people. Her most profound relationships are with objects.