Phobias can really be debilitating. I know from my experience of fear of heights. I cannot climb further than the 2nd rung on a ladder. I have to depend on others to do many things.

In my studies in psychology and mental health, the best therapy for any phobia is systematic desensitization. There is a workbook called "Anxiety and Phobia" that covers the step-by-step process. If she cannot leave the house right now to go see a therapist who specializes in this, she could start with the workbook until she can get to the point that she can go to a therapist's office. I forget the author. I have the book, but it is at home, and I am on vacation right now.