Families which have lived in more than one country often have different accents from one another. My husband and his family grew up in N. Ireland, and moved to Canada when the three children were teenagers. The oldest child also lived in Canada up until the age of six. They all have different accents because they all had different amounts of time in each country, and different influences. And that's only siblings raised together who spoke the same language in each country and at home. The differences could be even greater if they'd been raised apart, gone away to school, spoke other languages, et cetera.
Plus, I think it also sets her apart from everyone else, which it might be meant to do.
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