Whatever you don’t contact her boss.
Get her to write down exactly what happened, where and when. Any witnesses?
Don’t let the bully win.
Accept your holiday is going to be spoiled and start to prepare to fight back.
On Tuesday morning, engage a solicitor and talk to her union rep if she has one.
Get hold of her companies HR policies if they have any.
Prepare a written letter of complaining about the inappropriate behaviour of this person and hand it it to his manager and the head of the HR department.
Don’t let the bastards win. Stand up to the bullying behaviour.
They have no right to treat her or anyone like this.
Good luck!!