"No one inside Ireland would mistake her accent" is not a fair statement. I'm from north Wicklow myself and it took me a bit to realise she was even Irish when I first heard her. Her accent is more than slightly posh and has quite a bit of 'English' intonation. I can definitely imagine quite a few people outside of greater Dublin not recognising it as Irish especially older folk who aren't used to the homogenised 'young' Irish accent that's become prevalent.