Hi Villian,
When I was at school I had a similar experience to your daughter. I had just moved to a new Junior school and my mother packed my lunchbox as she always did, Orange, Peanut butter sandwich, raisins and a small pack of organic crisps. I was just about to start eating my crisps when a dinner lady stormed up, snatched the open bag from my hands and told me that I wasn't allowed them as I could choke (I was 6 at the time). This totally traumatised me, I proceeded to have a hysterical fit and had to be taken to the nurses office to calm down. The school I had been to previously was run by the same LEA and wasn't far away but had always allowed crisps at lunchtime. There was nothing in the written school rules to say I wasn't allowed crisps with my lunch, but apparently I wasn't on the say so of one dinner lady. I was unable to eat lunch at school without bursting into tears for several weeks and it was 7 years before I could eat crisps again. I'm NOT autistic and it is terrible to think that children who are are being scarred for life by crass insensativity. What our schools need is training for staff in how to handle children with a whole range of problems.