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.
safe2476680 artist:aztrial475 imported from derpibooru3641533 opaline arcana3578 sunny starscout24784 alicorn347060 pony1665843 spoiler:g535823 spoiler:my little pony: make your mark7219 artificial horn721 artificial wings3231 augmented4612 dialogue107473 duo173403 duo female35814 female1967969 g588258 horn190855 magic107582 magic horn649 magic wings1547 mare796659 my little pony: a new generation15658 race swap24106 speech bubble44739 sunnycorn1984 wings258499

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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.