All of the world is an adventure, and Aunt Queen, as she likes people to call her, has experienced alot of it. Old age has confined her to her home, and curio shop where she collects and sells cameos, books, and antiques.
When was the last time a character caught a cold or flu? Real people get them every now and again even with solid heating and dry interiors. Your characters are out in the cold and wet, and even inside is not always dry and warm. Imagine having to stop your dungeon crawl, sitting in a tight defensive position, while you all are feverish.