As much as I'd like to think this will help her, I looked at a video and I honestly think this would be a waste of money.
Something to consider when thinking about fitness... the most vital element of overall fitness has very little to do with muscles. Muscles are like the wheels on a car, they
are where the rubber meets the road as obviously they are the only thing moving your skeletal system around. However what is far more important is the engine, the nutrient delivery system.
The primary factor of how good of shape someone is in not their muscular development but rather their cardiovascular system, and the only muscles involved there are the heart and diaphragm which can only be developed aerobically. Someone with well developed heart, diaphragm, and muscle capillaries but poor muscle tone and extra fat will outperform someone with great muscles, low body fat, but poor cardiovascular development. Aside from the possible lymphatic stimulation, this machine seems to be focused on muscle development so I'm not sure it has much to offer her or her daughter.
I'm certainly not a doctor or a fitness expert but I think the best thing they could do is get some medication and look into low impact aerobic exercises like swimming or an elliptical machine. Better diet perhaps, too? Hope this helps.