Mother in Law Rant ! 😑

Soo my fiancé has to have 3 wisdom teeth removed in 3 weeks ... and my future mother in law thinks I’m incompetent in taking care of him after his procedure so she’s planning on staying TWO full weeks with us . we didn’t ask .. she volunteered. I told her that’d he’d be fine and she yelled at me “that there was no one better to care for him than his own mother” 🤦🏻‍♀️ we’ve been living together for a year now.. he’s 24! There has always been this weird competition for his attention .. I mean I would understand if he was an only child maybe but he’s the oldest out of the three brothers! We don’t even live in the same city 😑 and somehow she still manages to be the future mother in law from hell! And he won’t tell her anything because of course it’s his mother.. any advice ladies!?