"Mother Trudy" (German: Frau Trude) is a German fairy tale collected by the Brothers Grimm, tale number 43.
She arrives terrified, and Frau Trude questions her.
Frau Trude says she saw the witch in her proper attire, and that she had been waiting for the girl.
The tale is unusual in that the evil witch triumphs in the end; the child is defeated.
However, a common theme in Grimm tales is that children who do not obey their parents are punished, making it a signature Grimm story.