|Mentioned||The Hunger Games, Catching Fire|
Mrs. Undersee (née Donner) lived in the Merchant part of District 12 with her family.
When she was younger, her twin sister Maysilee Donner was selected as a tribute for the 50th Hunger Games. The same Hunger Games that Haymitch Abernathy won. Mrs. Undersee was friends with Mrs. Everdeen when they were children. Maysilee died during the 50th Hunger Games and Mrs. Undersee was never the same afterwards, suffering from massive headaches in her adulthood that caused her to lie in bed all day. Madge told this to Katniss, and she asked why they didn't get medicines from the Capitol, but was then told that even the mayor had his restrictions. When Gale was whipped Madge brought some of her mother's medicine to him.
Mrs. Undersee's husband is the mayor of District 12. She had one daughter, Madge Undersee. Her sister, Maysilee Donner, was killed in the 50th Hunger Games.
Mrs. Undersee, along with her husband, daughter, and servants, died in the bombing of District 12.