Below are some helpful links to other resources dealing with teen and teen girl stress management.
From the American Academy of Pediatrics, Your personal stress management plan.
More tips from The American Academy of Child and Adolescent Psychiatry
From US News and World Report, Exercising for Teen Mental Health
From the American Psychological Association, 5 Tips to Help Manage Stress
The New York Times offers a great guide for a five minute yoga practice in its guide, Want to Relax? Try Yoga
And, on a lighter note (but still great advice):
From Seventeen, The Real Girls Guide to Dealing with Stress