بسم الله الرحمن الرحيم
Read Surah Fatiha seven times with durood 11-11 times before and after and blow on water and give it to her to drink. Also recite Ya Salam (یَا سَلامُ) hundred times and blow over her body in the morning and evening. May Allah cure your mother! Amen!
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.