How to reduce weight at this age. Good.

My mother has thyroid since a long time and she takes her medicine regularly. She works a lot at home but still she is unable to reduce her weight. She has rheumatoid arthritis and because of it she is unable to do excercise or any extra outdoor activity to reduce weight. Pain killers have side effects on her so she is now taking ayurvedic medicines to get relief from pain. Recently i had her general health test from 1mg. Her thyroid was little high and also WBC count.but that was not too the extend that needs immediate doctor's attention. I mean she is coping up with things very nicely but still there is some lacking on healthcare by her. She has visited different doctors but still things aren't getting in her part. I'm unable to find a correct doctor for her so that we can take care of her health well and good.