Honestly, it sounds like 'coming in the back way' is not the answer. She needs something that will work from the mouth down, and not be too heavy. You may want to consider magnesium citrate. It comes in a bottle, and tastes like a soda, mostly. Cherry is my favorite. She will like it much better than any of the other options. As her bowels get softer from the top down, you can try both lower abdominal massage, and using a gloved, lubricated finger to help move the mass a bit if necessary. Lots and lots of KY will be need for this. It is important that some softening liquid be present in the colon at the time of massage so that it can help breakup the mass.