Try bowel cleansing first. Then, after she gets regular daily BMs and if she still has problems, start looking into Liver Flushing and lymph cleansing.
As for lymph cleansing, I once read one article claiming daily dry skin brushing as the cure for acne. How valid this is, I dont know personally, but it could help and its easy to start now. Both your lymph and your bowels are places where toxins can build up and Acne becomes a side effect with inflammation.