I think it is ok and only right to be appalled by isolation practice which repeatedly puts children into isolation.
I think it is ok and only right to be appalled and shocked about a girl attempting suicide while being placed in an isolating environment.
I think it is ok to get "wound up" about it.
I think it is typical that some posters who work in education will conflate their supposed isolation practice with extreme examples.
I think it will be typical that be govt cuts are blurred when all the media focus is on Brexit.
I think it is usual that some will blame the messenger (the OP in this case).
What can you do?
Well for a start:
Write to your MP about this.
check the @isolation practice" at your local school.
Write a letter to the head attaching the guardian article, speak to your teachers.
Get your pta to fund some assistance for sen.
Speak to your sen co-ordinator.
Speak to governors.
It is a start.