If the reality is as you have mentioned with regard to the continuity of her illness
and her inability to make up for the days of Sawm she missed, there will be no harm to delay making up for these days till she is able to perform them even if another Ramadan passes. Moreover, if her condition of inability to make up for the days of Sawm she missed continues, she has to feed a needy person half a Sa` (1 Sa`=3 kg. Approx.) of wheat, dates, rice or any of the staple food she usually has for every day of the days of Sawm she missed. She is not required to make up for the days of Sawm she missed as long as she is unable to perform them. (Part No. 10; Page No. 186) May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family, and Companions.