I don't know the complete circumstances but, Why would it be necessary for her to know of a "label" and be told that?(some people get worse when given a label,-- can be too overwhelming for some-- where as they may make progress if just given something to work on) Why can't she just be told gently of her symptoms-- and told of them one at a time?(told one and after she's worked on it for sometime, told a second one and so on...)
For example: Perhaps if she was encouraged to feel what it would be like to be a particular someone else- and then asked kindly to try and work on that.....

But I think like Perna said-- any person with mental struggles such as these- has to want to change in order for the change to happen..... and from what I've read-- most NPD's don't think they are the problem-- so it's not likely they would consider anything of the kind. Hopefully someone can compassionately get it acrossed to her that her life could be better-- maybe even much better....

I think you are very nice to be concerned.

mandy