Not trying to be snarky here, I promise, but where is all this "sorority" stuff coming from? No sorority that I've ever heard of conducts recruitment this way. Informal recruitment was mentioned above somewhere in a previous post and doesn't really mean what you might think it means. There is no "pledging" anymore except to refer simply to the time period between bidding and initiation, which, in itself, merely consists of a commemorative pinning ceremony. Each organization has it's owns traditions, so they vary. I have a good knowledge of this subject, however, not this campus. National organizations are very protective of their trademark, however, and have a consistent policy nationwide.
But I can tell you that charters are pulled every day for less. Fraternities are an entirely different matter
I would be shocked if this indeed, ended up having anything to do with sorority in any way.
ETA: As far as pledges ( pretty sure they aren't even supposed to use this term anymore, officially) are not ever be asked, coerced etc to do anything that any upperclass member isn't asked to do. The rules have gotten so strict, in fact, that they can't even have more innocent activities aimed at new members. There is both good and bad in this, but it is what happens when people abuse the rules that were in place previously. JMO.