Do you enforce rules regarding television, video games, and Internet usage?
Rather than banning them from your home, set a time limit on activities that could distract your student from doing homework or reading independently. More important, keep these distractions out of your student's bedroom and/or study area.
Does your student dismiss communication between you and a teacher?
If your student reacts negatively to the idea of you contacting her teacher, there could be a grade-related reason. This test is a subtle way to check up on your student's own perception of how well she is doing.