Rarity is getting ready for a photo shoot for “Vanity Mare” with Photo Finish with emphasis on her mane. She goes around town enhancing business for the Flower Ponies, a Scottish pony selling fans, and Davenport (Quills and Sofas). However, Rarity’s mane gets messed up by some super sticky string from Pinkie Pie celebrating the Cake Twins’ one-year sneeze anniversary. (It’s Pinkie Pie. Don’t question it.)
They both go to Zecora for a mane conditioner and a magical cleaning potion. Of course, without labels to tell which is which after Zecora pointed out what Rarity should take, the potions get switched. (By the way, those asking about labels have a more legitimate point than those asking why Rainbow Dash didn’t try to fight off/fly away from Caballeron’s hench ponies in last week’s episode. That said, this is a cartoon and the switcheroo is as old a trope as time.)
So instead of a soft, bouncy mane; Rarity has most of her mane removed. Since a new potion would take a while, she frantically goes to her friends to help fix her mane with the expected results that they are not super effective. This hurts Rarity since after the switch, ponies appear indifferent to her presence and now she has to cancel photo shoot.
The rest of the Mane Six and Starlight remind her that her mane isn’t the main thing about her and bring up her accomplishments on the show. Rejuvenated, Rarity inspires many a fandom artist by shining from the inside out. Oh, that photo shoot did take place thanks to Rarity’s friends and Rarity ends up on the cover of Vanity Mare.
If there is one given about MLP over the years, Rarity episodes are usually on song and wind up some of the better episodes of the series. This is no exception. Rarity’s MO is to bring the beauty out in everything, so it’s understandable that she wold get distraught if she can’t bring it out of herself after this incident. That’s why you have friends to help bring it from the inside out. Of course, when Rarity sports the punk look, that sets the episode alight.
Just when you think Season Seven might have been tapering off a bit (not that it really has), here’s Rarity to get every pony energized again.