Are you the CM in question here OP or related to her inn some way?
She was being paid to look after this child.
If the parent had requested the child not be taken out or supervised in a particular way then it was down to her to either not take on the child. The end. It really is that simple.
Instead she went against the mother’s wishes, having been made fully aware of the risks.
She should be prosecuted for manslaughter. There are no if’s and buts here.
And all this “it won’t bring the child back” bollocks is just language to protect the guilty.
As for “she will live with this for the rest of her life.” Good.
She should never be trusted to look after any child again.
It wasn’t an accident. It was deliberate neglect.