I am inclined to agree with wasabi on this.
Even if you take out the actual diagnosis.
The pattern of behavior is there. And it's unhealthy...remember you can't change her, you can only change yourself, how you respond to her, wether you continue to put up with it.

She very clearly doesn't like losing the spotlight or center stage. So can you be happy clinging on in the background nursing her needs, accepting it may not be possible for her to ever return the favour.

Time for a long hard think. Good luck.