What is the ruling of Islamic law regarding my mother making up the days of Ramadan that she missed due to her illness with diabetes, high blood pressure, and stomach issues, knowing that she takes two doses of insulin daily?

Fasting Ramadan is obligatory upon every sane, adult, capable, resident Muslim. Allah has permitted the breaking of the fast for the sick if fasting becomes difficult for them or harms them. The questioner's mother suffers from chronic diseases that worsen with fasting and pose a danger to her. Therefore, it is permissible for her to break her fast, and she must offer a fidyah (expiation) of feeding one poor person for each day she misses. If her condition improves and she is able to fast without harm, then fasting becomes obligatory for her. What she fasted in the past Ramadan is sufficient for her. For what she missed before that, she must feed one poor person for each day.