Fiona the muggleborn obviously didn't make it onto the train and she was mostly dumbstruck/in shock at the whole thing, didn't really know what to do/say so she just kinda accepted it rather than make a scene.
Max however would have had no qualms yelling at the officials a bit as they hassled her and her friends. She still got on the train and headed back but would have spent the ride griping about it everytime anybody mentioned it.