Several? Really? That wasn't my experience when I attended IU. I didn't do the Greek thing because I couldn't afford it and also because, with some exceptions, most of the Greeks I met weren't great people. Except for the black fraternity, can't remember the letters, all the frats and sororities were pretty much exclusively white. My wife was in a sorority when she was at IU (she was three years after me and I didn't know her then) and a few times when we've visited IU we've visited her house or at least drove by and all I saw was white women in her house and on the street. However, I left IU in ancient times (1983) and I don't think we've visited her house for at least 10 years so things might have changed. I checked
IU's Panhellenic Association website and it doesn't seem that it has changed all that much. I looked at several of the chapter pages and saw very little diversity. Most of the sororities appear to be 100% white, kind of like this one
and this one
Of course it's not surprising because greek life is expensive and many from black families probably have the same resource scarcity I did. I'm not claiming discrimination in any way. However, it surprises me that you said you have "several" AAs in your sorority. I didn't look at every chapter page, but I don't see any with several AAs among their membership. Most seem to have zero and very few other girls of color. However, I'm sure they're full of "woke" girls who know what it's like to be poor and minority. Good on you for working with a diverse sorority. Which one is yours?