I'm no doctor, and don't propose to be, so my advice is limited.

What can you do ? - it's always a difficult position to be in. Someone you love, being a way which you are not in a position to deal with, or know how to for that matter !
I would take her advice - My other half gave me that very advice, and it was one of the most difficult bit of advice to follow I've ever had to in my life - it's like your abandoning them, but remember you're not.

All the best and let us know how it's going.