or at least do this face to her 
next time she says it.
We went swimming together today and I had a banana for afterwards. Her son (nearly 2) wanted some and I asked her if it was okay - she asked me if it was organic. When I said I thought it was she said that her son couldnt have organic food as it brings him out in a rash. She then went into great detail of all the times he has waten organic food and been miserable and grumpy.