Making up the prayer for one who lost consciousness due to illness

Question:
The first questioner says: I have a sick mother who is over eighty years old. During her illness, she experiences memory loss and an inability to concentrate, to the point that she sometimes falls into a coma. Consequently, she leaves off the prayer. What is the ruling in the Shari'ah regarding her leaving off the prayer? Is it permissible for us to pay an expiation for her, or do something about this leaving off? Please inform us, and may Allah reward you with good.

Answer:
Leaving off the prayer has no expiation. However, if her dizziness and coma are brief, less than three days, she must make up the prayers when she recovers. When she recovers and the coma lifts, she makes up what is due from her according to her condition; she makes it up according to her condition. But if the coma is frequent, exceeding three days, she owes no making up, because the obligation is lifted by a frequent coma that exceeds three days. The specification of three days is because it was reported from some of the Companions that he was unconscious for three days, and when he recovered, he made up the prayers that were due from him. Yes.