Sorry, you did not find my post constructive but, I still think the same about her inquiring about her sons' day. I don't know how her tone was when she asked those questions but to be honest, I can't think of any tone that would upset me if a parent asks me about their kids day. On your first post you did not mentioned about her wanting organic food. You can tell her that you don't serve organic food simple.

I'm not here to poke you, you asked advice and I'm giving. And I'm telling you that it wouldn't bother me if she asks me those questions. In fact, I tell whole my families how our day was? What they had for lunch? etc. before they even ask.
I feel there is something else happened in the past which irritate you that's why you find it annoying when she ask questions.

Cocoon