I really don't even know what to say. Taking care of my grandpa a few years back and realizing he was declining was miserable. You never feel like you're doing enough. Watching someone you care about suffer is terrible, but at least with my grandpa it was expected. He was in his 80s and ill for years. Don't beat yourself up over not doing more. You aren't at fault and you are doing what she needs by being there for her.Your friend may seem resigned to fate, but I imagine it could also be a way to cope with the possible future. Just be there for her, and don't worry about whether you're doing "enough" or helping "the right way". There is no right way besides being her friend like you always have been.