Lil,
I was in the same situation you were in this semester. The best advice i got was from my suitemate. He told me "No matter what happens in that class, you have to look out for number one." When is comes down to it, you'll intend to graduate with honors, and what she makes of her life/college experience is up to her, you can only do so much, and it seems as if you've done your part to help her.