Bottom right, just can't see her face.

It's the beginning of Season Three and there's STILL…
PEOPLE…
COMPLAINING!

Even after the staff was putting her in intentionally, she has never been in every single episode.
Claiming that she wasn't there as some kind of slight or insult is just stupid.
Derpy is all over the place.
The show staff know we exist and love us.
Do they really need to tell us all the time?

(This is all beside the fact that she was in the premier, as Crazy pointed out, but my argument still holds. Stop with the entitlement complex.)