>I think we have already seen her in the show once twice perhaps by that point.
explain this

>Y'known there is a certain bug queen who has a certain ability to change shape right? >
>Crissy certainly seems like a safe bet.
using the changelings for everything could serve as a wild card until the 6th season before their redemption.

>All the other villains sans Discord are Crystallis/changlings? How do I guess this! Because every other villains is one off usually. Think about it!
are we talking about villains before the Power Ponies event or throughout the entire show? Because if we are counting until the last season, Sombra didn´t turn out to be a one off character (even though he got revived for his second attempt in The Beginning of the End). The sirens are kind of a questionable case and while Nightmare Moon and even Daybreaker appeared more than once, we would have to imply that the royal sisters did this so they don´t count. Almost everyone else got the redemption route (Dolores, Tempest or even the changelings themselves) or completely disappeared (The Storm King)

So, perhaps you have a point on the villains part.

>Why is Crissy always getting away with things at the very end! Becuz she is every other vilian she is the Palpatine of my little pony. Terik wouldnn't be able to send letters without Derpy's help and we know Derpy wouldn't help an evil fellow like Tirek. It was Cozy who and Cozy was the plant! knnow where I am going with this right!? Cozy is the the weeds in he S 4 premier she is Crissy or a one of her changeling minions.

I disagree that Chrysalis gets away with it all the time. While she got better over time at planning her strategies with a more cold headed mind (especially in the last season), she has had several fails whose net result was negative in every single aspect (the wedding, Thorax and even The Mean 6) so she gets away with it in the sense that she manages to appear over and over again.

However, that doesn´t take away her recurrent attempts and you might have a point that Cozy Glow or even a changeling (most likely the former. We implied that the Chancellor ordered Cozy to report him when it didn´t turn out that way in the end) could do the task in order to lure the Mane 6 for another challenge that looked fictional at first sight but still could be another attempt to get rid of them for taking over Equestria.