What I did is I explain to her after a few time she don't want to listen and being stubborn I just ignore and walk off with baby whenever she start. I've explained to my husband. If I talk back I'm rude and might be very offensive so I just keep quiet walk off to avoid argument.
Do explain nicely to your mil or get your husband to talk to her. Sometimes we can't blame the old folks for loving our kids too much. But of course there needs to be a limit and you should voice out if you feel they are spoiling your kids..
Let her know that you want the kids to grow independent
i will try to explain.