What is the amount of fidya that a grandmother suffering from diabetes and heart disease must pay for each day she did not fast in Ramadan, and is it paid daily or after the end of the month, and is zakat obligatory upon her?

If a trustworthy doctor informs a patient that fasting is difficult or harmful for her, she is permitted to break her fast, and it becomes obligatory for her if it causes her harm. If she is unable to make up the fast later, with no hope of recovery, then she must pay a fidyah (expiation) for each day, which is one mudd of the staple food of the country (approximately 750 grams of rice). This should be given to the poor and can be paid daily or at the end of the month. However, it is not permissible to pay it in advance for a day or to pay it all together at the beginning of the month. Furthermore, Zakat becomes obligatory upon complete ownership, reaching the nisab (minimum threshold), and the passing of a full year. Zakat al-Fitr becomes obligatory at sunset on the last day of Ramadan.