The Ortho Phos is an Ortho Phosphoric acid dilution. This is a bone softener and should be used with care, and only 2-3 times per year for the 3-day flush period.
I am a little concerned about your aunt’s age when considering this flush. As a general rule I do not suggest that it be used when there is an underlying health problem in addition to advanced years.
The Liver & Gall Bladder flush can be a little rough on the body. When you drink the olive oil, it causes the Liver & Gall Bladder to spasm-thus tossing off the stones. This spasm action is almost never felt, but could be harder on an older person.
However, if she is strong and healthy and her doctor agrees that it is okay, she could probably decide to do it.
It would be better I think, to just stick with the Maiden Barber, White Mallow and Blood Purifiers for her cleanse. If she has been doing the Total Cleanse for a year, she has probably already done the Liver & Gall Bladder flush twice, and that should be quite effective if she has a good diet, and not too many prescription medications.