"Okay, everypony, please. Calm down!" Twilight waved her hooves in as calming a fashion as she could manage, hoping to placate the mob of ponies outside her library. She didn't spend any time wondering why they all thought she was the one who could fix it; obviously she was.
"Calm down?" Rarity stomped a hoof. "I just had a Pinkie hurricane raging through my shop!"
"And they ruined our critter picnic," Fluttershy added.
Twilight overpowered the crowd's shouting. "Take it easy, ponies. I've got this. I'll just cast a magic rewind spell to undo any magic done on Pinkie within the last day or so."
That mollified them.
Her horn glowing brightly, Twilight sent a burst of magic to the nearest Pinkie. It didn't matter which one; once they were rewinded far enough, they would unite.
The mob of pink ponies flashed through a bizarre series of states. Hitherto, nopony had realized just how much magic that earth pony experienced. But, before long, the duplicates began merging back together, half at a time. After only a few iterations, there were just four, then two, then only one.
After that, Pinkie got a stern talking to, and agreed to singlehoofedly repair all the damage her duplicates had done... which took her several minutes.
I can just picture all those Pinkies merging into one, would be a little creepy but cool.
If there was a different type of series, the effect would have been a regular Pinkie -- the original -- and a giant clone that ends up destroying large portions of the town in the fun equivalent of a rampage. Just imagine the damage a thirty foot Pinkie could do while ponking around shouting "fun, fun, fun."
Well at least there was no murder this time.
Unfortunately, the Pinkie that was left over was the wrong one.
~KBO.
This could have been solved earlier:
Pinkie Pie: "Timing myself galloping back and forth between the swimming hole and Sweet Apple Acres. I'm trying to cut down my time so if Rainbow Dash dives off the swing, I can get to Sweet Apple Acres to help with the barn raising, and then be back in time to see Rainbow Dash hit the water after doing a double flip! If I can cut my time by only twenty minutes, I'm good."
Twilight Sparkle: "Don’t worry. I’ll just cast a time travel spell on you. That way you could be at both places at once."
6331514 Thank you! Somebody got it! ...oh wait. Don't screw with time.