Can my mother fast despite her diabetes, and if not, what wazifas can we do to help?

Alhamdulillah my mother is very religious. But last year she became very ill due to diabetes and had to admit to hospital in ICU ward. But Alhamdulillah she got well by the grace of Allah. But the problem is that the doctors have advised her not to fast in the month of Ramadan. Last year since she was critically ill even we did not allow her to fast. But Alhamdulillah she is keeping well now but is on daily medication and doctors advise her to eat every 4 hours failing which her sugar level may increase. My mother has been fasting ever since she can remember and now she is very upset with this as she very desperately wants to fast at least in the month of Ramadan. Request you to please remember her in your dua and kindly suggest some wazifa for me and my mother to overcome the disease or at least my mother reaches a stage even with diabetes that at least she can fast.