Tell her to avoid this like it's a plague. Most of these diets and products are sold by multi-level marketers or by people/companies that have shady operations, IMO.
Even the ones that I would trust, and I've used some as a curiosity, still seem pretty flaky to me. But even these don't recommend the kind of restriction that that plan does. That's just crazy (and not crazy as in "That's genius!" but crazy in "That's f*king stupid!).
She doesn't need laxatives, she needs a solid, well-balanced nutritional plan that includes plenty of healthy fiber and all the nutrients she needs. I recommend JB's Precision Nutrition.