Why is the scary old lady crazy?

Because her grandson was abducted by a strange girl, the old woman was stimulated and fell into extreme panic and anger. In order to find her grandson, the old woman did not hesitate to perform a series of extreme actions, including blowing the little girl's head off with a shotgun, smashing the girl's head with a cane, hitting the girl with a pot, etc. These behaviors not only make people feel extremely frightened, but also make people shocked and puzzled by the crazy behavior of the old lady.