Exception To The "One Year" Rule?

[AchtungBaby80]

Yesterday, my friend (who belongs to another sorority on the same campus as mine) and I were talking about our pledging experiences, and she mentioned that as a freshman she had accepted a bid from a different sorority than the one she's a member of now, but had depledged because she didn't feel at home there. When I asked her about her experience with formal rush the second time around, she told me that she had joined the sorority she's in now as a sophomore through COB because she wasn't allowed to go through formal recruitment the next year, as she had witnessed a "ritual activity" with the first sorority and therefore had to wait. Now, I always heard that once you accept a bid, you are bound to that sorority for one year and one year only, regardless of when you depledge, which would have made her eligible for rush the following fall (we only do recruitment once a year, in August), right? She was never initiated into the first sorority, obviously, so I think someone misinformed her. Am I wrong? It really doesn't matter, since she loves her sorority, but just for my own information...has anybody heard of this?