My mother-in-law shows up unannounced, comes to our bedroom without knocking. What should I do?

We received an email from a distressed lady. She feels like her mother-in-law does not respect her marriage at all. She is concerned that her mother-in-law visits unannounced and while she is visiting, she doesn't respect their privacy, even gets into their bedroom without knocking. Our relationship and marriage counselor Dayan Masinde gave her this advise