How to deal with somebody that panicked on the motorway while driving?

I visited my cousin in Canada from the uk and she panicked on the motorway with 4 or 5 lanes and completely stopped. I also don’t have a licence so I couldn’t help her or obviously know the directions around the city of Toronto. I felt like she was very rude as she was shouting and entire was just exhausting as she was obviously having a hard time driving

How to deal with somebody that panicked on the motorway while driving?
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