hi melanie.
DD,s consultant psychiarist and also a clinical psych went into school last week,this was after i phoned them to tell them that school were making DD sit on the toilet against her will,the psych had already written to school telling them not to do so.
it does sound like the consultant is going in to sort the school out like jimjams suggested,they do come across this a lot,this also happened with DS and recently with my nephew,on both times the consultant told school exactly about the childrens difficulties and smoothed over the problems.
last week after the visit to DD,s school the psych phoned me and told me that there will be no more forced toileting,she had made that clear to school,since then the teacher hasnt really looked me in the eye-am i bothered?????? NO!!!!!
your DS teacher sounds like my DS teacher (who was a complete cow and the SENCO) she did EVERYTHING to stop him getting a dx of ASD, so in the end we went over her head.
good luck for tomorrow,remember the consulants are on DSs side,they must get awfully frustrated at the way some education "experts" consider they know everything about a child.
also second what jimjams says,we try and show video (off DH phone) and photos of DD having difficulties,not nice to see or hear but sometimes the only way to prove what you are saying.