Contact National HQ to find out a current alumnae contact person in the area, and be sure to let them know that you are having trouble getting in touch with someone. Every state should have an alumnae membership chairman right now, so National should have that person's name on file.
HQ is getting VERY serious about alumnae involvement, so I would think you'd get results if you send them an e-mail. If not, please let me know and I'll see if I can't do a little detective work for you to locate the MIA alumnae!