Answer:
Dissonance theory states the cognitive stress that a person hold due to belief in two or more contradictory ideas that goes against each other.
In the above situation, Willows mother seems to believe in punishing to stop a certain behavior from occurring again but she does not give a strong punishment due to her lack of belief in the mere idea of punishing to reinforce a behavior in children.
Therefore she uses punishment which is insufficient, therefore adhering to both her beliefs.
