A.W.
Maybe when your daughter misbehaves and your MOL starts to open her mouth just say "Oh, thanks, I got it" or "Oh, its ok, I'll take care of it/her" and then get up and proceed with punishment. Take her to another room so you MOL is not watching over your shoulder. Hopefully after many "interventions" like this, she'll get the hint. Maybe even say something playful like "Oh, I'll take care of the dirty work, you just have fun with your grandbaby". I've learned that I can say almost anything to my MOL as long as I say it with a smile and a sense of humor!!