Hi Cheese, LOL, there are some organisations that even the people referring to them do not understand! There was a post earlier in the week with one MNer's child being referred to a group and the people referring didn't even know what the initials stood for!!!
Which group was the SENCO referring to?
IME your DS is at an age where so much changes in there lives that if there is something they find difficulties with, e.g. social communication, then this is the age it can really come to the fore.
My son has some hypermobility and the OTs are the best people to help with this. As for hypersensitivity/sensory issues. My son is also sensitive to sound, smell and taste so I know what you're going through. Does he say that everything is too loud? I have taken to telling DS1 that he can put his hands over his ears if the baby is yelling, or if things are very loud, but not if an adult is talking to him. We've also practiced counting to 10 and taking deep breaths and at school, if he feels himself beginning 'not to like' the person he's with, or what he's doing, he asks for a drink from his water bottle (this is a tip from the NAS actually) which he is allowed and breaks the cycle.
The traffic light system is my name for it, it's actually called the Incredible 5 point scale. I first heard of it from another MNer, and I also heard about it at a seminar earlier in the month (although my DS1 is a bit young for it). It involves a scale and noting on the scale how he feels and how he is reacting and what level of 'melt down' he is at... see here
You might want to create a new post before you buy as I know one of the nice ladies on here has created a blog with a wealth of info on this.
For stickers, I always make sure I'm giving DS an achievable goal and that, at times, he can reprieve himself "You did not listen to mummy but you were very kind to your little brother. So you do not get a sticker for listening, but you do get one for being kind". I don't think there is anything worng with giving them differnt goals (I wait to be corrected) so make sure her goals are things that she needs to work on the same as his are.
It sounds like you are doing a fantastic job already, and you now have the holidays to try and bash your way through the system.
I've found MN to be my life line so don't be afraid to ask questions on here. There ain't nothing they don't know!!
BR
PS. Sorry for the long rambling post!!