You can avoid this problem by asking her to send an email message to you. There are occasional queries on the list about finding writers for gigs. You can also call them if you are in a hurry. Adrienne Rich does list her publisher, so that is the route you take. That is unusual.
Most writers list their own addresses or that of their agents.
The directory generally comes out every two years. Thus it is relatively current. It lists by states, but also has an index in the back.