You know, now that I think about it, I'm starting to like my theory about everything being fake. It would make sense as it would explain why she had a portal (the whole thing is a test), why Sunset is just now existing, why there are humans who look like the ponies in Equestria (Celestia probably based the humans off ponies in Equestria), a villain would be a good challenge for a new princess, and why the rest of the mane 6 couldn't come; it was a test that Twilight had to do alone to prove herself.
Also, it would make a good twist and it would make the whole thing non-canon due to everything not being real.
Actually, the more I think about, the more I think it's actually going to happen.