Who is Mrs. Daisy Luttrell from Curtain and what is their importance?

Daisy Luttrell is an older woman who is described as having a lot of white curly hair, rosy pink cheeks and blue eyes. She is also said to be frail. Daisy runs the Styles guesthouse with her husband, Colonel Luttrell, and she is known for being a shrewd business woman. Over the course of the novel, Mrs. Luttrell is shot by her husband, who mistakes her for a rabbit. After she recovers, she seems to be a little nicer.