Judgmental types never stop with their “observations” and advice, so she’ll do it again. Perhaps stopping in your tracks, acting shocked and saying “Cruella, I’m so surprised by these judge-y (insert your own adjective) comments! To a child!! *Gasp* I thought you were kind!!”

When she sputters around defensively, (i.e. “Just trying to help/concerned about health blah blah) you can say “We don’t comment on other people’s bodies at our house. Experts agree it’s very damaging.” And just repeat that until she is bored.

A judgmental person’s greatest fear is that others will think less of them.