Answer: Selective listening.
Explanation:
Selective listening is defined as the listening process in which a person tends to filter out the information that doesn't matches with their thoughts and views.Attention is paid to the selected information which listener wants to hear.
According to the question,Cheryl is displaying selective listening mechanism in which she is not paying attention to her mother's word as she does not want to hear that but she is interested in Dylan's conversation and so she pays attention.
