Although my situation is different than yours, I can definitely understand that feeling of not wanting to step on other people's territory. I am currently starting a chapter (Beta Sigma Phi) from scratch, too. The International Headquarters has provided plenty of helpful materials. I have experience in PR and development/organizing, but nothing has helped me deal with my concern that the other GLOs on campus will think I am trying to squirm in where I'm not wanted. What I hope Greeks here will come to understand is that Beta Sigma Phi is different than the other GLOs on campus in many ways, and it will be a community chapter--not limited to the campus. Panhel Rush is next week, and I'm so afraid that people are going to see my ads and think we're a bunch of wanna-be's.
My only advice to you (and what I keep telling myself) is to hold your head up, and promote your chapter in a very positive way. Continue to emphasize that you want to help Greek Life prosper by offering another opportunity for sisterhood. Promote your group to all students...remember the "multi" in multicultural
Also, since the Black Student Alliance is no longer active, you could promote your org. as an opportunity to highlight the small, yet beneficial presence of women of color on your campus.
Just some thoughts...
Erica