Why did Sophie wriggle when Geoff told her father that she had met Danny Casey?

She wriggled when Geoff told her father that she had met Danny Casey because she was well aware of her father’s short-tempered nature. She knew that he would scold her for spreading wild stories. Moreover, she was aware that no one would believe her. It is also possible that she did not expect Geoff to share her secrets with others, even family members.