It's happened before, but just don't tell Rainbow Dash.

In which Pinkie Pie finds out what turns Flash Sentry on.

Not long after the girls saved Camp Everfree and embraced their newfound magical abilities, Sunset Shimmer starts acting strangely. She jumps every time her friends get even remotely close to her and she keeps everyone at a distance. This is especially worrying to Twilight Sparkle, who seeks how to make her best friend feel better.

-Equestria Girls Four Spoilers abound.
-Inspired by a bit of sunny picspam I discovered.

Twilight Sparkle gets a surprise phone call from Sunset Shimmer out of nowhere. It's nothing to worry about... right?

As a bright and promising student entering her senior year at Canterlot High School, Trixie Lulamoon thought she was prepared for many things... the least of which was being magically summoned across dimensions by her equine doppelganger to perform an all-important task. A bit of a warning would have been nice. Some clothes would have been nicer.

For the former apprentice of Princess Celestia, science experiments are fun and enlightening. Then, one day, magical butterflies start haunting Sunset Shimmer from every corner, even hours after the experiment is long done. Now it's time to panic.

Are there times you've ever wondered, "Jee, why did the girls at Canterlot High forgive Sunset Shimmer for her evil succubus meddling so easily?"

The answer's simple: "Because, deep down, she's a pretty pretty pony, you stupid melon fudges!"