Who is Lucky from Johnny Got His Gun and what is their importance?

Lucky is the nicest, smartest, and best of the Parisian prostitutes. Lucky receives Joe Bonham in her room stark naked and gossips while crocheting a doily. She has a six or seven-year-old son in school in Long Island, being raised to be a polo player. Lucky nets $150-$200 a week, minus the cost of her necessarily fancy wardrobe. She survives the San Francisco earthquake in her teens, so she must be almost thirty now. She races into the street naked, refusing to die with some son-of-a-bitch on top of her. Talking with Lucky brings peace and removes loneliness in this strange city.