Who is Miss Grace Ironwood from That Hideous Strength and what is their importance?

Miss Ironwood is a medical doctor living at the house at St. Anne's. The details of her life are not described in the book. She is the person who talks to Jane before Jane is taken to see Dr. Ransom. Mrs. Ironwood takes care of Dr. Ransom because he was somehow wounded on Venus, and he is in great pain from this wound.