Cassidy Often Fails to Complete Homework Before Bedtime

Cassidy often fails to complete homework before bedtime. As a fifth grader she knows she needs to do homework when she gets home, but she gets on her computer and plays video games with her friends and other random players. When her mom gets home, it's time to help with dinner and chores. Her mom, believing Cassidy is old enough to take responsibility for her homework, doesn't like to hassle with Cassidy over homework before bedtime. How might Cassidy's mom use cognitive behaviour modification to improve this situation? In your answer, include specific quotes the mom might use.