Its not northern arizona but there are Tri-Sigma alumnae chapters in both Phoenix and Tucson.
http://www.sigmasigmasigma.org/pages...s_list#Arizona
If you're in Flagstaff you might contact the NAU panhellenic and see if there's an alumnae panhellenic there.
if you're in Prescott you might contact the Embry-Riddle panhellenic and see if there's an alumnae panhellenic there.