You're right, they should have made her a centaur. They really should have. That would have been perfect, thematically speaking. In fact, I hope they eventually reprint her as a centaur, it just makes way too much sense. Not to mention all the centaurs I've ever seen depicted ANYWHERE were white and male! It would be good to see some more diversity among the centaur race. Although I imagine a lot of sexist people would start making MLP jokes whenever they see her, at least at first before the depiction of female centaurs became more common.