ANSWER:

If doctors say she is chronically ill and will never be able to fast again, she must feed one poor Muslim one meal at the end of every day of Ramadan. She can also prepare food and feed 30 poor Muslim at the end of the month however, if this is not a chronic illness, there is no expiation on her and she must make it up as soon as she is able to. 

If a person cannot fast due to a long term illness when should they pay for their missed fasts. If they don’t pay in Ramadan then can they pay at another time throughout the year or is there a deadline for which payment must be made ?