Symbal, I'm sorry on behalf of my sisters at that chapter for their behavior, and I'm absolutely floored that they would act in such a way. Un-Sigma-like, indeed!
On the subject of hijacking, our chapter had a 'no drinking in letters' policy. I'm pretty sure our girls knew it was a chapter policy, not national, but they also knew that some of the other chapters did not have this policy (and tended to have sisters being 'sloppy drunks' at fraternity parties), and when I was on Exec I never heard any complaints about it.
Symbal - how is recruitment going? And how's your weather? I'd hate to be going through recruitment here right now, with all the rain!