Some People learn by Seeing through eyes, Some people learn by hearing through ears, Some people learn by doing activities.
Here the Girl needed an auditory confirmation about the act she was about to do.
Our Unconscious mind is highly moral and it already knows what is right and what is wrong according to the feed it has received while growing up.Sometimes all it needs is a nudge to decide, whether to perform the action or not. or in this case – an auditory confirmation which is also known as “Needed to hear that from somebody”