Time, I hate hearing it but it's true, time. things may come together and they may not, harsh but true :-( I am at the other end of such a situation. Over a year I was in a relationship that to both of seemed to be a forever relationship, but as my depression worsened and so many questions where raised in my head it became unbearable, I just wanted to be with family. I ended it, I am ridden with guilt each day, and wonder was the love I felt for him real. If we where meant to be, with time, it will happen. It broke him to begin with, but now, he is more understanding and is taking my words and going out and moving on. I still have feelings for him, and always will . . but I knew for me, it was better this way.
Fingers crossed once she gets the help she need things will click back into place for you, and if not, be strong and don't give up on love, often our first love is not to be our last