I'd say it is time to take over her life. She won't like it, but that's the consequence for lousy grades.

Insist that a planner be filled out every day in every class. I would insist that she have each teacher sign the planner to verify that what she has written is accurate. Check the planner each night. Check that homework is completed each night. (No, don't sit and hold her hand.) Set up consequences. No planner filled out and signed, no phone, no computer, no life. Refuses to do homework. Ditto.

Do NOT let up on this. Do NOT compromise.

I have to do this with my 14 year old ADHD son. He's gotten used to it. His grades are back up. His study skills have improved. Am I going to stop doing this? Not this year. Next year he'll start on his own and he knows what is in store if he doesn't take care of his business.

My oldest, now 20, went through the same stage. Once he hit high school, we never had to intervene again. He knew what he had to do to keep me out of his school life. He took care of his business.

It may seem harsh, but as a teacher, I welcome parents who hold the line on responsibility. I've even had parents show up to school without telling their kid and go through the day with their student. (Of course they let the teachers know they were going to do this ahead of time.)

I'm not saying my kids make all A's. In fact, I've never insisted on that. However, there is absolutely no reason to be failing classes unless there is a real academic issue going on (which has never been the case for my kids and it doesn't sound like that's the issue here either.) Passing classes is simply their responsibility.