Narcissists are notoriously hard to treat because they do not believe they have a problem, nothing is their fault. Nothing.
Telling her she 'has a problem' would likely result in resentment, indignation and narcissist rage.
I don't believe most narcissists have a fragile ego, its an old theory which is out dated.

The Ns in my life are as tough as old boots. The only fragile, or should I stay non existent ego is mine, any ego I had was crushed, destroyed by them years ago.

Might be better for you to just get on with your life.

After saying that, you could try and help her if you really want to, just don't expect too much.