We're really small too, but grown exponentially since I pledged. I pledged alone, since me (fall '06) we've had pledge groups of 2-4 women a semester, and gone from 4 to 12 sisters. We're trying to keep our numbers up but it's hard being a small local. We also lost a lot of our organizational methods (and some ritual) when we got to be so small (before I pledged.) I'm the oldest sister now (sophomore when I pledged) and I'm trying really hard to enrich those traditions and get us more organized before I leave. I have faith in our e-board now though, they're all really committed girls.
All of us are incredibly different so we're also hard to market (we're not a particular 'kind' of girl, and really, really diverse) and the biggest sororities (nationals) are 80+. It's hard for a modest little group to compete with all that glam, especially being a part of the same council. But I love us, and though I've wished for a better Greek experience a few times, I always look around and realize that even with all our problems I'd still choose us today.