Is it permissible to pay fidyah for the days one missed fasting in Ramadan due to menstruation and did not make up for them due to an illness that prevents completing the fast, or must they be made up?

A menstruating woman must make up for the days she missed fasting. Compensation through expiation (fidyah) is not permissible unless one is unable to fast due to an incurable illness. Muslims have unanimously agreed on the obligation for a menstruating woman to make up for missed fasts. It is not permissible to delay making up the fasts until the following Ramadan without a valid excuse. If the questioner was unaware of the impermissibility of delaying the make-up fasts, then only making them up is required of her. If the illness is expected to heal, then it is permissible to delay making up the fasts until recovery.