What you shared would creep me out too. Good thing she lives overseas and you don't have to see her very often. She is invading your personal space. If you are still dealing with her, the next time she is hovering around you I recommend you being firm with her and saying flat out with her. Mother-in-law, you have been invading my personal space and I don't like it so please stop invading my personal space from now on. When people are like this, especially when you are alone with them you have to stand your ground and let them know you will not tolerate these kind of interactions. Other wise they will just keep doing it.