Hello there.
I can understand your concern.
Let me tell you something about hypothyroidism.
Hypothyroidism means that her
thyroid isn't able to produce enough amounts of thyroid hormone.
So she should take the thyroid hormone in form of tablets.
There is no such foods or anything which could cause increase production of thyroid hormone because the thyroid gland isn't functioning properly.
She should lose weight, how much she should lose is to be decided by taking her height into consideration.
But for starters, 15kgs would definitely be needed to be reduced.
Consult a endocrinologist in person for further evaluation and management.
Best regards.
Dr. Anil Kumar Jain.
Bangalore.