Sometimes it can be very, very hard to remember --or believe-- that you're awesome. Fortunately, that's what friends are for. (Sunset Shimmer checks on Rainbow Dash.)
I jumped through the portal to escape Celestiaʼs wrath. Now, I find myself in this strange, new world. But thatʼs okay, Iʼll figure it out, like I always do.
After rumors of magical events, Daring Do comes to Canterlot. Concurrently, Sunset Shimmer finds herself burdened with an overabundance of free time. They talk.
At her lowest point, Sunset meets Adagio, Aria, and Sonata, human teenagers who have never heard of Equestria and have no idea what the students at CHS think they've done.
Wallflower just wanted to be forgotten. It was best for everyone if she was just left alone for good. That's why she hates Sunset, for never just giving her what she wanted. That's why she loves her too.
It was a simple dynamic. Simple enough that it didn't require any questions, only the unspoken agreement to remain silent. It only required Twilight broken into pieces, so she could never put herself back together again.
Trapped on the other side of the mirror, Twilight Sparkle has to adapt to a world without magic. Given the circumstances, that is the least of her worries.