It's like helping an alcoholic...to care about but not take care "of" is hard.
But if you go to some of the links here, and get some insight, that will help you know what and what not to do.
It is hopeful that she has sought help already. Doing an intervention (done with a professional in charge) might help her give it the extra effort and attention that she has to give it.
If she has any spiritual leanings, she might have to decide who's the team leader between her and her creator. This is why a lot of 12 step programs focus on spiritual or "inner" change. As a group, we are control freaks - and the addiction/obsessive behaviour is us 'playing God', to our own detriment. We aren't good at it!
Using our willpower in line with a Higher Power is the solution.
I don't want to push or proselytize - but if you know her well, this might be a key. It's worked for millions.
HUGS and good luck!
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