There are a couple of issues here about responding to issues like this.
Firstly, there is the issue of parents accepting that schools have procedures for dealing with situations like these. They are laid down and will be applied. Are parents willing to accept that the schools will deal with staff appropriately? Parents need to accept that they will not be told the details of any disciplinary action.....it would be entirely inappropriate, considering that in most cases, the staff member continues to work with the pupils and parents. Any disciplinary procedures are personal and private.
Secondly, what about a proportionate response? In this case we don't really know what happened, because the OP never returned after the first post (which in itself suggests to me that the incident might have been exaggerated or turned out to be less serious than she initially thought....was never clear if the parent had been involved at all, or was responding simply to what the DD had said)
Whilst teachers do need to behave appropriately and to face follow-up if they don't , I feel there are some parents on here who hugely over-react to anything which happens to their child (often without the full facts being established first) and then demand massive and dis-proportionate repercussions. Their first reaction to their child describing what has happened (often incompletely) is to be furious with the school and want all kinds of major action taken.
Surely the first response should ways be to gather information first......find out exactly what happened. This involves talking to the school, and being rational rather than angry is likely to result in more information being gained. The school is not the enemy, but some parents like to see them as such. They are always looking for something to complain about,to insist on their rights or point out a violation of rights, or to see their child being victimised and never in the wrong.
We don't know exactly what happened here....whether a book was thrown onto the desk and hit the pupil, or if it was thrown at the pupil. We don't know if this teacher has done this kind of thing before or never in a 25 year old career. WE DONT KNOW. Therefore we cannot say what should happen.
If we were parents in this situation, we would need to contact the school and gather more information. And in the vast majority of cases we should accept the schools action plan, without knowing the full details of it. And then we should try to move on. This child needs to complete Year 6. She doesn't need to be caught up in a big argument with the school, which drags on and is brought up frequently at home. She needs to know that her parents and the school have spoken about it and it is being dealt with. End of.
When parents react so quickly on a thread like this, which has such limited information about what happened, I always wonder what they must be like in real life. Do they react so hastily and just jump in demanding a sacking then too? Or do they ask the crucial questions first? It am in no way advocating teachers throwing stuff at kids or getting away with it if they do....but I am advocating that parents find out what has happened first and in the majority of cases believe the school when they say they will deal with it.