Thats a very long list, largely irrelevant to you, but to start at the top.
YOu clearly have no idea how many assessment are emailed out between pastoral and teaching staff - literally dozens, it is constant. maybe this teacher slipped through the net, maybe not, but they forgot or didn't notice the email
She doesn't punish the "main bully" - well, she has has probably got a better idea of the whole picture than you do, and is in a better position to judge who is the main bully, and what the appropriate response is.
YOu are not really in a position to know what the autistic child is entitled to, or what they got- not your child? This is just tittle tattle.
A mother wanting a meeting to "discuss her behaviour and lies"? Someone approaching any of our staff with that attitude would likely be banned from the premises.
If your child is bullied outside the school gates, then this is a police matter, not a school matter.
This sounds like a pile on of parents, to be honest, and I expect it is being manipulated and fuelled by children who have been reprimanded
I feel very sorry for her - in her shoes I would look for a different, better paid job, where she is less open to abuse - and anyone with the experience to be a PM has the experience to get a better paid job too - her hourly rate is very probably below the minimum wage