well, ask then, if you want to.
I don't think this sort of complaint against people involved in a child protection hearing is particularly unusual, and it generally isn't allowed to disrupt or delay anything.
In this case it sounds like a bit of he said, she said, and all just hearsay as well,
and a previous poster pointed out, you are not doing yourself any favours if you don't cooperate.
And the chances of anyone being available to replace a SENCO is pretty small. Someone else has got to drop their classes and set cover and be available at short notice???
You say she is being investigated? But your later posts imply that is what you hope is going to happen, but you have not made a complaint yet?
it all sounds like blowing smoke around, to be honest, but go ahead, ask, if you want to, but think about it first.