This is a rather obscure crossover, with Dot and the Kangaroo, an Australian cartoon from 1977. It has no category on fanfiction.net or archiveofourown.org, and relatively few works on deviantart.org.
Somehow, I had never known about this fic before now. If you haven't read it yet and don't want to be spoiled, don't bother reading the rest of this post.
[Most of this entry is unintelligible. What isn’t is unsuitable for publication. The name “APPLEJACK” in several instances is written with so much force as to tear through the paper.]
Oh dear. She found out. And she does not have time for a coup. This will not end well for anyone involved.
Well, I'd already assumed that. Now it looks like it'll end even worse.