@raynbow- Writing out your thoughts in a journal is very therapeutic, especially for people who enjoy expressing their thoughts through writing. Putting words on paper helps many people clear their minds and put problems into perspective.
However, if your friend is having problems, she should not just start a journal. She needs to seek the help of a professional cognitive behavioral therapists who can help her get her anxiety symptoms under control and assist her with her journal writing. This will help her get the most therapeutic benefits from this type of treatment.