Well,since canonically she does end up killing a god it's as a valid an argument as any. Yes, I know that was after she ended up a goddess herself, shut up.

And if we get really desperate, Xena-verse Zeus and Ares are such man-whores it's not totally out of the realm of possibility that one of the two is in her family tree a half-dozen generations back, leaving her without nifty powers but still having funky blood.