Don't push her, she will push back. (that's what I would do) Don't tell her she isn't trying, it doesn't help. Be there for her, as a friend, but take care of yourself.

It doesn't make things better, but it sure can help to vent.

If she ever needs stitches, take her to get medical attention, It's hard but she needs support, distract her from what is going on, spend time with her, but not at a risk of yourself. If you want to help her, then you need to take care of yourself.

Don't be mad, forgive and become a friend to her. This is an illness just like cancer.