Know you can't let her go now but that being said....this chick is only gonna get worse. She is playing the "your not as good as me" card. Every once in a while I get a Mom that seems to be bent out of shape over ME getting her kid rather than HER. Kinda sounds like that here....she is going to point out to you that no matter how hard you try, you will NEVER match up to her greatness!!!! Just tell her that's what you feed the kids and IF she doesn't like it? she is more than welcome to pack a "healthier" meal for her child or go somewhere where they serve "healthier" food. What a b****! She only trying to knock you down a notch for some reason, just let her and then give it back by telling her she can provide his food from now on.