I don’t know, If Cozy Glow was meant to be a villain from the very beginning, then I don’t think a child should be a villain in this show. I would have been fine if she had the same age as the Mane 6 for example, that would make more sense.
I have the feeling they either kinda switched different screenplays even though the double episodes were written by Josh Haber of they did the bare minimum. I wouldn’t be suprised if it happens to be one of the two scenarios, because, if they wanted Cozy Glow to be a villain from the beginning, then that says a lot about the writters in the show.
To be fair, I don’t really blame them. It was very hard to make the show believable by the time it was finishing, considering that so many things were happening in the last seasons that prevented the show from going back to normal. It was whacky, but at least it was something. And, by the time I was finishing the show last year, I embraced the jank of the show and see it with another perspective.