What Pre-movie episodes hasn't Derpy been in?

The Season 4 opening has me wondering, have there been any episodes in the original 65 that she clearly wasn’t in?

Over a Barrel  
….  
There’s more that’s all I can think of right now.

@Background Pony  
Thanks. Found something that says which episodes she was in after all.
 
I’m wondering how many there were where she clearly wasn’t there, though: no part of a gray pony that might have been her in any shot.

You can just check the MLP wiki: http://mlp.wikia.com/wiki/Derpy  
There is even a table for what you’re looking for at the bottom, check “Appearances”