Also there is an acne forum which may be more informative.
Have you taken your daughter to the doctor?
B/C is a long term solution, there are other options such as tetralysal etc. I had acne and
when I went to the doctor he only mentioned b/c as a last resort. At the moment I am weaning myself off tetralysal and my skin has cleared completely. Echinacea is an over the counter supplement which also helped me. Best of luck to you and your daughter.
Brands of bc pills like Yasmin work well for acne. My doc put me on yasmin for medical reasons, but since starting it I havent had a pimple yet.