What is the ruling of Islamic law regarding a woman who broke her fast for the entire month of Ramadan 31 years ago due to childbirth and has not made up for it until now?

If a woman remains in a state of post-natal bleeding (nifas) until the end of Ramadan, she must make up the missed fasts before the next Ramadan. If she deliberately delays making them up without a valid excuse, she must make them up and feed one poor person for each day as expiation for the delay. However, if she delays due to an excuse or out of ignorance, she only needs to make up the fasts. If she becomes pure before the end of the month and breaks her fast without a valid excuse, she has sinned and must make up the fasts and feed one poor person. If she breaks her fast for breastfeeding, she must make up the fasts along with the fidyah (expiation) for delaying them. In summary: In all cases, she is required to make up the fasts and pay the fidyah for delaying them. If she is unable to make up the fasts due to old age, she must feed one poor person for each day along with the fidyah for the delay. The fidyah is a mudd of food, and half a saa' is more cautious.