My friend is having trouble keeping up with the class. You suspect that bad study habits may be causing her grades to drop.
I would be very worried for my friend. She is usually a very good student. I would aproach her and ask what is wrong. Also, ask if there were any problems at home and if there was anything i could do to help. If there was something else preoccupying her mind, like a friend problem or family problem I would do my best to help her through anything. If the problem was that she simply just didnt understand the material I would become her personal tutor. I hate watching my friends struggle when there is something I can do to help. After all of this I would hope that her grades increase and her problems go away.