Young adult acne

My daughter had a total of 2 pimples during high school, but now at 22 she has acne located on both cheek areas. I am so proud of her that she does not want to use drugs for a fix, but needless to say at this age, she is frustrated with her challenge. The chiroprator told her to get off dairy and she did with some improvement to her complextion, but the outbreaks still come and go. She needs a plan. With so many recommendations out there it is hard to come up with a comprehensive plan. Suggestions? Cleansing the liver? Diet suggestions? Herbs?

many thanks