Yeah, she announced that she was leaving at the end of season one!
At that time, she had gotten through script approval for season two, but that was the full extent of her involvement there.
She hasn't worked on the show in over a year now.
The fact that some people didn't even notice proves that the current team s fully capable of carrying on Ms. Faust's creation.
Thank you Lauren for all the work you've don creating this wonderful show and universe, and thank you Studio B for continuing her work so adeptly!

NOOOOOOOOOOOOOOOOOOOOO!

Argh! I.. I can't… no! No! NOOOOOOOOOO!

It's the end of an era. Thank you for all you've done, Mrs. Faust, I wish you the best of luck on all of your future endeavors, you will truly be missed.