Bizarre comedy disguised as something else. Humans are being transported to Equestria through no fault of their own. The only polite thing to do is to help them settle in, and that includes trading in their old money for Equestrian bits.
The woods are lovely, dark, deep... and dangerous. But Dinky wasn't planning on going anywhere near them. Her mommy told her not to, and she always listened to her mommy...
Princess Twilight Sparkle writes pony history by opening a portal to another world and making first contact with extra-Equestrian intelligence. Only snag: the portal opens at a pony ranch on Earth.