Teen, Have Hypothyroid, Weight Gain, No Period Without Pills, On Deviry And Yasmin, Weight Constant After Workout. Suggestion?

Hi doctor, my daughter is 17yr old. She is having Hypothyroid problem since last 2 yrs. She is gaining weight and there is no period without pills. Now her weight is 78kg. Now she is taking combination of Yasmin and Deviry pills from last month. After that period occured, again she statred the combination from 1st day as suggested by an endocronologist. But the problem is there is no weightloss after doing workout plus she getting lumbness in breasts and they are increasing. She is taking Eltroxin 50mg in the morning and Xmet 1gm twice in a day. Please suggest.