A character's dying and being resurrected is not exactly a new occurrence in either science fiction or fantasy. Following the framework expressed in Joseph Campbell's The Hero with a Thousand Faces, the real point should be that Starbuck is being used in the story to bring back some message to the community that resolves some major problem.
Let's look at what Starbuck does that is unique for her character. She is some sort of tactical genius, for instance, only her team survives the storming of the Cylon base holding the child that is everyone's hope hostage. We observe that the order of events seems to be that Starbuck uses various revelations and her tactical genius to ensure that the Cylons ability to resurrect is destroyed forever, and only then can she have the insight that she knows the coordinates to our Earth.
What is so terrible about the Cylons resurrection, after all, a form of it is basically the dream of some in this world who wish to have their consciousness preserved forever in some sort of machine form. But it's not hard to see in other science fiction such as the Japanese Ghost in the Shell an objection, which one can hear in the speech of the Puppet Master when he declares that life must involve dying and reproduction similar to how biological lifeforms use DNA, NOT preservation of a program which can be corrupted. Cylon resurrection then represents anti-life, and it's not hard to see in Ron Moore's series how anti-life is eventually self-destructive to itself.
Starbuck is life's answer to anti-life. There's no perfection, but we see at least twice that Starbuck has to come to terms with her past, both her mother and her absentee father, and all the terrible things that have made her what she is, because that is the way of life.
But how does life performs such miracles. In my interpretation, a theme that one can see in authors such as Charles Stross, what we see in Ron Moore's Battlestar Galactica is a brief snapshot in the timeline of life that evolves in some distant future to some entity beyond time and space, something that can be called Life. The alternate versions of Baltar and Six who comment at the end on humanity are the developing consciousness of this entity. This entity Life then when is able to create itself--it is able to perform various miracles and induce various revelations in its past. Starbuck is therefore an angel of Life, an angel of death to the anti-life.
But what is Starback reconciling then. What her character shows as a revelation is a theme as old as the oldest of human stories, from the Epic of Gilgamesh at least to now, the struggle with death, and the meaning of life.