Mike, my mom says the same as you-- she raised us, now her job is to do the fun stuff, be loving, see perfection in her grandkids... My MIL is pure evil. No sane grandparent even thinks about criticizing their grandkids, let alone actually doing it! Now, if the girls misbehave of course I expect anyone to be allowed to correct them. But out of the blue "hey your haircut is like a boy and I don't like it and it's not girly" is just plain nasty.
Screw her. She has a hideous haircut, her daughter is jealous that I have 2 girls (she has one son) and I am leaps and bounds above them in beauty inside and out so I can see I guess that jealousy and anger and misery rears its head in lots of ways.
Hair can grow back (if D6 decides she doesn't like it still) but ugly insides within people are there for good. The inlaws are the losers in all of this. I should pity them instead of dislike them. For now I dislike. Maybe I'll get to pity in a bit....