Hi Jill!
Welcome to GC and potential NPC sisterhood. Be sure to read all the Alumnae Initiation threads. While chapter makeup varies from chapter to chapter, state to state, every NPC group has initiated non-white members. I am Hispanic and was initated in a very diverse chapter on a diverse campus. Don't be discouraged by any negativity that may be brought on by people on this board (it is a public board!)
Good luck with your process!