Must a woman who missed 15 days of Ramadan due to childbirth and did not make them up until the next Ramadan came, offer expiation or only perform a make-up fast?

If a woman delays making up her Ramadan fasts until the next Ramadan begins without a valid excuse, she is sinful and must repent. She must also make up the missed days and pay an expiation for each day, which is one mudd of food (approximately 750 grams), or, to be more cautious, half a sa' (1.5 kilograms) if the delay was intentional and she was aware of its prohibition. However, if the delay was due to forgetfulness or ignorance, then she only needs to make up the fasts.