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Has she gone to the union?
Yes she must go to the union. She cannot go after the employer herself because she is in a union so she must have the union represent her.
The employer has breached its agreement and so the union can file a grievance.
You get all the replies you need.
Do find out if she was a member of the union.
But if she wasn't then the collective agreement will not apply and so while this means she could sue them after only working three months she would not get anything by way of damages except for perhaps one week's pay if she worked there over three months. If it was under then she would not get anything because she can be dismissed for no reason and without any termination pay within the first three months.
Yes it is.