Please continue to follow her doctor's instructions.However , I think she can discontinue mefenamic acid
hydrochloride combination. I hope she is taking all the medications after food.
She might be having gastroenteritis
and even after recovery it takes a while to get back the original appetite. Have bland food like rice gruel, soups etc, which will help by rehydrating her as well as provide her energy.
Burning sensation in the throat could be due to infection/ acidity related problems. Please visit the doctor if symptoms persist.
Hope this helps.
Dr. Divya Kuttikrishnan