The pain in the head and other areas could come from the fruit juice in the juicing. I did the master clease years ago. It was ok, but it sounds like her system is baucking. I prefer the Dr. Schulze 5 day detox Bowel Cleanse and then go from there. Very good in that food can be taken along with the product. Food choices can be changed on a slower basis. Every system and person is different. Good luck.
Larry