Cost adds up but their far cheaper than coconut water. Good balance of vitamins and electrolytes. The sugars are high though. Otherwise their solid choices. The lytes are the real choice then if you must add sugar as desired.
Thyroid condition? How could she be so low on uptake of calories if she is truly getting enough. Some other autoimmune disease or organ issue? There's lots of factors could play into uptake and processing of foods. Allergies to foods..