I'm kind of with you. I don't object to her alignment too much (though I do agree that I'd prefer a more "real" unaligned than "evil light"). My main objection to her story is that the pantheon has
way too many gods who used to be mortals (or at least, not gods).
Vecna. The Raven Queen. If you ignore my article and go by
Divine Power, Bane. (
Divine Power is wrong, of course.

) Asmodeus wasn't a mortal, but he still wasn't a god. Frankly, I think having more than one--
maybe two, if you allow for Asmodeus being a corner case--dilutes the concept. It makes the mortals-turned-gods less special, and it makes the gods look weak. (Sure, it's "only" four, but that's two too many, at 20% of the pantheon.)
I'd rather have
either seen the Raven Queen with a different origin,
or I'd like to have seen 4E return Vecna to his status as an ancient archlich/undead bogeyman, perhaps with the power of a demigod.