What is the obligatory advice to follow in dealing with my mother-in-law who interferes in my life, verbally abuses me, and demands that I leave the house, the second floor of which I built with my own money, knowing that my husband is aware of her wrongdoing but refuses to anger his mother?

It is the wife's right that her husband provide her with an independent dwelling fully equipped with facilities. It is also her right to have a separate entrance for her dwelling, and the husband is not permitted to deny her this. She should inform her husband of this gently and kindly, enduring any harm from his family, because honoring them is part of honoring him and having a good relationship with him. Repelling evil with good dispels animosity and hatred.