There are lymph nodes in the occipital region -- they're even called the "occipital nodes." This website has a good diagram:
Link: Diagram of Occipital Nodes. Lymph nodes & vessels actually cover the entire body.
My recommendation, Kindredspirits, is to have this person seek out a Lymph Drainage Therapist. Injuries often cause disruption in the lymphatic system -- not so much permanent damage as a shift in the pathways that can cause swelling, pain, numbness, etc. An LDT specialist can usually correct such abnormalities, restoring the lymph system to normal function. Sharon, you might refer your client to an LDT specialist as well. Even when there isn't swelling, lymphatic therapy can really speed up the healing process. Kindredspirits, don't worry about convincing the doctor. Doctors aren't trained in treating this problem anyway. She needs to see a Lymphatic Specialist. Here's a link to the "Find a Practitioner" section of Upledger's website:
http://www.iahp.com/pages/search/index.php
Select location on the left, and in the box on the right, highlight "Lymph Drainage Therapy". You don't need someone who's reached the certification level, but you do need someone who has completed level two of the training. (Level 2 is where they teach assessment & correction of abnormal pathways.)
I hope that helps.