I thought it was the signing of the PREF card (after Pref) that made you ineligible for a year.
Either way, if you never actually did either, then I don't see how you are ineligible.
Pref card, bid card - same thing. It's all technically an MRABA. Obviously there are women recruited through completely open rush or just plain word of mouth/friends in the sorority who never sign a "pref card" as they never attend any sort of pref party.
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It is all 33girl's fault. ~DrPhil