Sunset Shimmer had changed much ever since Twilight had left. And she then received a letter from Equestria that Twilight was coming back to see her.
Sunset Shimmer had a very good plan.
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"Escaping through the portal was a great idea!" Snips exclaimed as soon as they got out the mirror in the Crystal Empire, it was the dead of night there, so no-pony could hear them.
" You two stand back" Sunset Shimmer said, turning round to make sure that Snips and Snails were far back. She pulled out the sledgehammer, and smashed the portal... Forever.

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Twilight finds out that Sunset Shimmer had left, with no way of turning back.

Will Twilight find her in time?