It is a herbal medicine and we don't know which herb causes acne
as there are almost 11 herbs in it.
You can give a gap of one month and see whether the acne subside or not. It is kind of a test and there is no harm in not taking it for one month.
If you want to continue with the drug then she should do frequent washing of the face and apply clindamycin
Avoid spicy and fatty foods