Hi there!
I'm so unbelievably sorry to hear about your problem...as the president of a local in Cleveland, I totally get what you're saying. My best advice is to follow the advice you've been given in these previous posts...making your chapter as visible as possible will increase awareness, which will increase curiosity, which will increase the number of girls who rush your chapter! One thing that we've always done is be proud of what makes us different...we're the only local chapter on campus and the 5th oldest local in the country (I'm a Sigma Psi, by the way
) and of course we are incredibly proud of that, but the trick is making it sound like the best thing in the world. During one of our rush events that we have to have in rooms outside of our house, we take every piece of memorabilia we can find (old composites, pledge paddles, etc.) and put it everywhere and then talk to everyone about how cool it is that you can be a part of campus history when you join our chapter.
Also, we do this little thing we like to call "pre-recruiting," which is more or less talking to girls extensively before they actually go through recruitment to keep up their interests...also, the point of this is to introduce them to as many sisters as possible so they understand how diverse we are and that they can find a home here. I would read up a little bit about pre-recruiting or just general skills on persuasion (or bring in a speaker, like the director of greek life at your school) and how to talk to people and hold a little workshop for your sisters to boost their confidence.
I hope that was helpful. Please keep your chin up and remember what an amazing thing a local sorority is when it's members are committed to their values. Best of luck!