X.D.
Her nerves are normal. I brought my daughter to a health professional to explain the whole thing. Teenagers need to hear things from someone other than their parents sometimes. If you have already done this, stress relaxation techniques with her. Tell her that you will see the doctor again in six months and will have some tests then if she still hasn't gotten her period. Stress that she is a normal - lots of girls have the same thing happen! Take care.