This is a very heavy model thanks to the ribbon animations and the numerous Cinematic animations (I mean, what can I say? She moves gracefully). Texture animations for most of these are not working correctly for unknown reasons (your guess is as good as mine; this is still very much voodoo territory as far as Warcraft 3 modeling is concerned).
Apparently Charity Auriel was meant for some kind of charity promotion (perhaps similar to that of Charity Mercy from Overwatch), but was never promoted or added to the game proper. It still exists in the game files. On the other hand, it is just another skin for the Spirit Healer.
Fun fact: Hanamura Auriel's kimono is folded over in the burial manner as befitting her status as a creature of the afterlife.
All these models are beautiful, but the Charity and Spirit Healer models are absolutely unrivaled. In my opinion, these are undoubtedly the best models on the site.By the way, the angel as the mercy aspect does not look like this. Perhaps this is what mercy looks like in angels. (sic.) I know these are Blizzard names.