Be polite , but be direct .Tell her that you do not welcome her criticism however well meant.
Tell her if you want to have feedback , you will ask her for the feedback.Your partner may not be fully aware of her nuisance value.If all else fails be blunt.Cheers, Joe
This. The first thing I would advice you try is to tell her. You can be nice and polite about it, but just tell her that you would prefer to practice in quiet, and get your corrections from sensei.