Is it permissible to pay expiation (kaffarah) for making up missed Ramadan fasts for someone who is exhausted by fasting (severe headaches) and cannot make them up before the next Ramadan, and what is the amount of expiation due for one day in the event of delaying the fast?

Severe, unbearable headaches are considered an illness that permits breaking the fast. The sister who asked the question may break her fast until she recovers from the headache. She is not obligated to pay the expiation for delaying if Ramadan arrives and she has not completed the make-up fast due to the excuse. She must make up the days she missed whenever she recovers, and expiation does not suffice for making up the fasts as long as she is not afflicted with a chronic illness.