Mrs. Arlert

 was the mother of Armin Arlert.

Personality
Mrs. Arlert appeared to be a very courageous woman, willing to risk her own life in order to escape beyond the Walls. The fact that she and her husband were able to design a hot air balloon that would carry them beyond the Walls indicates that she was a remarkably intelligent woman.

History
Mrs. Smith and her husband were both killed by Military Police Brigade member Djel Sannes for attempting to escape the Walls.