Welcome!
I'm really surprised that HQ didn't give you an alumnae chapter contact. I know that when I contacted HQ for the org I'm pursuing AI with, I was given the name of a contact person within a couple of days of sending the first email.
If the first person you PM'ed doesn't contact you, definitely contact someone else who's a member of that org. Everyone here has been really great.
Best of luck from one Jen to another!