Yes you are right about that, I only mentioned it because it seemed that this is the first time she is doing the 2-3 week cycle. This not even 1 a month, if she did it only 15x in 2 years. I have to assume it might not work for everybody, but a lot of people have mentioned that they were successful and may be it will take her longer.
Of course it is the same old story, it might be important to do other cleanses too, like bowel and kidney. Mine went away just with flushing and then later I did the other cleanses.
I also started eating according to my Ayurveda bodytype.