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In "Winter Wrap Up", one Pegasus tells Rainbow Dash that "Ditzy Doo accidentally flew north for the southern birds". I kind of thought it was an attempt by Lauren Faust to give this pony a more fitting name, but I guess not. =x
At the end of the episode, an impostor derpy (same color, same mark, only difference is purple hair) is shown briefly leading the birds back. Of course, it's possible (probable, even), that this isn't Ditzy, but I always took this as a joke from the animators.
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From what I heard "winter Wrap Up" was written before Derpy became popular
I'm not sure when WWU was written, but the first instance of derp-eyes was near the end of the very first episode. I doubt that it took /b/ very long after it was released to notice the (supposed) error in animation, so it's entirely possible that they were referencing Derpy in WWU.
Or not, I'm just making speculation.