I don't think there is much you can do, until she feels the pain.

I am sort of laughing because that sounds like me. It took me failing a paper in COLLEGE to learn time management. Then I cried for about a day, and figured out time management and study skills. Of course, I didn't have academic-minded parents on top of me, so as long as my grades were good, they didn't care.

I think the best you can do is set aside time for homework/studying.