Most ridiculous reason Jennifer might have turned evil.

[Lordxana0]

She realizes that Twilight exists somewhere in the fictional verse, and she will do all she can to kill it.

[The Wild West Pyro]

She realizes that Twilight exists somewhere in the fictional verse, and she will do all she can to kill it.

That shall explain a lot then.

[narrativedilettante]

Nah, that'd be too sympathetic.

[JRPictures]

Nah, that'd be too sympathetic.

But it works so much.

[Scarab]

She realizes that Twilight exists somewhere in the fictional verse, and she will do all she can to kill it.

...If that were the case then I'd probably side with her. If you know, she hadn't shot Don.

[The Finch]

There's been a lack of ponies, and she honestly thinks she can bring the Mane 6 out. Everybody ridiculed her, so she turned evil, wanting to bring them out, control them and then bring out Celestia, banish us to the moon, and then take over the universe, somehow destroying it in the way.