Online check in error - wrong nationality on boarding pass!

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Hi can anyone please advise- my mother has somehow got switzeland on her boarding pass when it should say she is from the UK?
She is due to fly from perpignan to stansted - she has tried calling but nobody is answering, I would be grateful if anyone has advice on whether she should sort it out at the airport in France before departure and if it would hinder her flying if it isn't sorted? Thanks!