Description:

(this going with the headcanon that Alicorns were a race of ponies that died out in scarcity years ago.)

I think Opaline is a natural born Alicorn with very conservative ideas on what constitutes a Alicorn. So when presented with Sunny's weak alicorn form, she's sees it as a costume worn by a earth pony. A mockery of the "prestige" that is the Alicorn race.
safe2494414 artist:aztrial493 imported from derpibooru3667657 opaline arcana3629 sunny starscout25417 alicorn350420 pony1680921 spoiler:g536035 spoiler:my little pony: make your mark7219 artificial horn774 artificial wings3318 augmented4718 dialogue108804 duo176710 duo female37102 female1985876 g590559 horn198601 magic108569 magic horn697 magic wings1599 mare805478 my little pony: a new generation16133 race swap24444 speech bubble45436 sunnycorn2041 wings263157

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1 comment posted
skybrook

Is it seriously not obvious? Like, seriously?

G4 is canon, so that means if you do something super special you get a merit badge in the form of being transformed into an alicorn princess.

Opaline was a unicorn. And now she lives in her lonely castle, with the only other unicorn who didn't cast her out for being a mutated freak.

Alternatively, she's Izzy traveling back in time to prevent her dark future from coming to pass.