"Well, there was princess Twilight Sparkle, the Element of Magic. There was also Princess Cadence and her daughter Flurry Heart. And that's about it. Why?"

Hmm. So was that intentionally AU or an accident?
Back when FOE was written, twilight was a unicorn and the goddess was created as a result of Twilights attempt to empower unicorns to make super soldiers. I think. its been a while.

I dont even think cadance existed back then either.