Hey LG,
Simply put, do you Ma. That means getting enough strenght to let your friend know that you can not help her right now, but as soon as you are done w/ the bar exam (which I know you will pass

), if she needs you, you are willing to listen.
Remember, she, or anyone else, can help you pass the exam. I'm no attorney, but I've seen folks while studying for the bar - from my eyes, it's no joke.
If she can't understand, let the chips fall.