Flurry Heart is able to leap through Time, Space, and Dimensions at will. But there's a little more than just 'leaping through'. She can alter them, either by messing with historic events, or by magically merging Dimensions together.
She's merged several together, giving her a small flock of little cousins. But Twilight wants her to stop. How can she stop when she's just trying to fix things?

Obviously, in the future. Probably around 17 years in the future.
Part of the Cornerverse Continuity
Rated Teen for minor swearing and some dark ideas