I have an underactive thyroid and i have been on eltroxin since 1987, (did u know she gets all prescriptions free for life now whatever the meds?) it is a problem and unless the dose is accurate she will not achieve any weight loss at all. the thyroxin (eltroxin) is a fickle med, it has to be just right, and after all these years I have learnt that it is right at certain times and at others it is merely life saving. She needs to avoid wheat, bread, eggs, pork, sunlight, harsh shampoos, and try to relax after meals to help her slow matabolism kick in. it can be really hard to lose weight with a thyroid condition and dieting is not the answer , correct diet is, eating small meals 4 times a day will help, oil of evening primrose will too, but only if it isn't being stored as fat elsewhere lol. there is a booklet she can get from any pharmacy that will tell her more, but it isn't solely food that will be causing her to not lose weight.