Who is Mrs. Ivy Maggs from That Hideous Strength and what is their importance?

Mrs. Maggs begins the story as a housekeeper for the Studdocks. However, when the N.I.C.E. destroys Bragdon Wood, she is thrown out of her house, which is on the edge of the Wood. She goes to live at St. Anne's because of the N.I.C.E.'s actions. When she comes to live at the house at St. Anne's, she is no longer a part of the lower class. She is regarded as an equal among members of this group.