What is the ruling on the behavior of the husband's mother who enters the spouses' bedroom and prays in it without permission, and is it permissible for the wife to close her room door to prevent her entry, given that there is another place for prayer, and is she entitled to speak with her husband about this matter?

The mother-in-law entering her son's wife's room without permission is a Sharia (definition)-prohibited error due to violating others' privacy. It is advised to be patient and pray for her, and to wisely come to an understanding with the husband to avoid discord. It is permissible to close the room door unless doing so would result in greater harm, in which case private items should be concealed. The mother-in-law should be a support for her son, especially with the wife's illness. Frequently seeking forgiveness and remembering Allah brings tranquility.