The Giantess was mentioned by Jack when he journeyed into the castle of her husband, the male Giant, where she kept Jack hidden from him. After her husband dies from falling down Jack's beanstalk, she enters the woods below intending to get vengeance against the boy. She appears in the woods demanding where Jack was to the group of people, killing Jack's mother in the process. To stop her rampage, the Baker, Jack, Cinderella and Red Riding Hood fake Jack's death to the Giant while she gets hit by the Baker and Jack and falls over, resulting in her death.
She is from the original tale "Jack and the Beanstalk" as the wife of the Giant. However, this version is based more closely on the one from the original musical of Into the Woods.
The Giant was the only giant alive after her husband died
In the original production she is an unseen character.