Chapter 4- "A Pegasai can only do so much..enter, Sunset Shimmer, can the former pricness of celestia help the elements out in this time of crisis?:

Sunset Shimmer slowly entered Celestia's Chamers, having sensesd the element of magic had vanished from Equestria. Celestia looked startled, "Sunset Shimmer....oh thank goodness! Twilight went into this town in the everfree, and didn't return. Whats worse, the element of magic has vanished!" Sunset Looked shocked, "Celestia...Let me help! I'm part of the alternate world elements! Maybe i can fill in and possible go looking for Twilight with everyone once we can survive!" Celestia seemed greatful, "Thank you so much sunset.." she said, temporarily turning Sunset into an alicorn. "Its just temporary.but this power should be enough to help you and the girls bring Twilight, my sister and my eldest Sister back, and free the town from the curse i accidentaly gave it 1000 years ago." Sunset bowed, "i will do my best, Princess." She said, leaving the castle to head to ponyville to speak with the others.

Down In Ponyville, Rarity looked a bit shocked. "So your saying you came here to help?" Sunset sighed, "i felt bad about what i did to you.....i had to make it up to you guys somehow!" Rainbow Dash spoke, "Thanks.. It hasn't been the same without Twilight, and now the crystal empire has reported their Empress Cadence and Emperor Shining Armor dissapered! I can only guess Twilight was involved.." Sunset Shimmer looked worried, "I believe it... There Twilights brother and Sister in law....If anyone could make them go, it's Twilight..I also heard Princess Luna dissapered." Pinkie Pie spoke, "Not just her.....Trixie has been gone a while too.." Sunset Shimmer looked crestfallen hearing her best friend in the AU world's Equestrian counterpart had dissapered.."Then i have to help! Trixie, well the AU Trixie, is my best friend!" AppleJack smiled, "Well as long as you know friendship is the greatest magic of all, i'm sure you can save them all, Sunset. After all, you beat the demon inside you...compared to that, this should be easy!" "Thanks Applejack..You truley are an Honest friend." Sunset Shimmer said, looking at the setting sun that soon turned into the blood red moon.

down in sunnytown, greyhoof looked pissed off."I WILL NOT LET THAT DAMN ALICORN RUIN MY FUN!" Threeleaf looked at him concerned, but went back to clearing the clouds. Starlet However, looked up from the Dress she was designing to look to Greyhoof and only give a dissaperoving glare.Mitta just turned back to the Animals she was watching, and Roneo continued harvesting starbits from trees, and starfruit. Trixie quickly came out, "Greyhoof, mind your toung mister!" she said, "the Princess wouldn't be too happy." Anastasia soon came out of the castle, "Greyhoof stop that this instant!"Anastasha had used the Royal Canterlot Voice,proving she was disspleased."We expect better from our personal element bearers! Now bite thy toung!" Greyhoof immidiatly went back to planning a party, scared of the princess's Canterlot voice.

Back in Ponyville, Twilight was visiting and met up with Sunset. a Magic duel begamn, with everyone watching in awe.

SUnset lukily managed to defeat twilight, protecting poor Applebloom who nearly got dragged back to Sunnytown. AppleJack just hugged sunset, "Thank you so very much, Sunset Shimmer for protecting mah little sis!" "No problem AppleJack.." Sunset said, glad she could help.smiling."I'll always eb there for you guys- like i was there for my friends in the AU.." Sunset said, and the rainbow of light was in the sky Celestia glanced up from the castle, and smiled.

Author's Note

Yes, in my story each sunnytown pony represents an element.\
Greyhoof is laughter, Starlet is generosity, Mitta is Kindness, Threeleaf is Loyalty, and Roneo is Honesty with Trixie being Magic. Anastasia and Twilight are the princesses, and Luna is the senior princess.
And yes, i brought sunset shimmer in as a protagonist, for all of those who believe she can change. I did this for you! and for myself, sicne i also believe she can change. by the way, roneo is a pegasai, as is threeleaf and Mitta. Starlet is a unicorn, trixie an alicorn and greyhoof an earth pony. Gladstone ha sno element, as he is the Spike of the story. Trixie is Twilight in this scenario because she's Anastasia';s Student.
The picture at the end is what Sunset wishes, but Twilight is kinda cursed right now. that visions in Sunsets Head.
i hope this clears up confusions!