So we’re back to ’nobody can make jokes like this’.

Repeating the same nonsense over and over doesn't make it any more true.

She’s lost her job

As she should.

and will never be able to get back into teaching

That's up to schools to decide. If they decide they don't want someone on their staff that thinks it's okay to joke about murdering children, that's their prerogative. No one is doing that to her, she did that to herself.