I need to find her a new name, I don't like Carmina as much as I first tought.
So, here is the phenix skulldancer from this pic [link]
And the problem with the reviving part of the phenix life had been resolved. Carmina IS the phenix, made human.
Basically, curious about the human way of life, the phenix decided to try and live as one. It find a dying girl, wait for the very moment when her soul leave her body, and jump into the body.
During a whole lifetime, it learnt to live with humans, using its ancient skull to use power the human body doesn't have. It learnt to live, discover dancing, that it love very very much cause it feel like flying, and, in a nuttshell, live a very good life.
A few years later, as the human body start to show sign of being overloaded with phenix's power and start decaying, the phenix decided it was time to find another body.
And what better way for a reborning fire chicken than infusing it's own unborn child?
Numerous generation had passed now, and the phenix still live among humans, ginving birth to itself in a neverending circle.

Skulldancer concept and Carmina are mine.