Now that your mother has entered the dormitory with you, you must explain the reasons to your roommate, which can alleviate her anxiety to some extent. Of course, it would be better if you could give your roommate some small gifts as compensation for this.

Then I want to say that your dormitory is not your own, but you live with many roommates. Your roommate gives your mother a hard look, which means they don't want outsiders in the dormitory. Your mother is an outsider to them. Even if you have to bring your mother into the dormitory, you should inform your roommate in advance, explain what to do and dispel his doubts.

It is taboo for people who are not in the dormitory to share a dormitory. Because outsiders will cause a lot of unnecessary trouble. Be sure to pay attention in the future.