How does an elderly woman observe mourning for her deceased husband?

Question:
A questioner says: My mother is advanced in age and has a weak memory; she has even forgotten some of her children and does not know how to pray properly. Is the pen lifted from her? My father has passed away, so how should she observe mourning for him?

Answer:
Yes, as long as she is a wife and her husband died while she was in his marriage, she remains in the house. She should avoid perfume and avoid wearing adornment. This is part of the rulings of the waiting period. She stays in the house except when necessary; she may go out during the day for her needs and then return.
She should avoid adornment in her clothing and on her body. She should avoid perfume in all its forms. Yes, this is the mourning, and she stays in the house until she completes four months and ten days. Then, if she is able to go out and has a need, she may go out. If she needs treatment, she goes out during the day. There is no harm in going out after four months and ten days. If she wants to move from one house to another or to another country, there is no harm. Yes.