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Does she really speak like that? :lol: Уж0с.
But I can't hear an accent through the text, so the answer is "I don't know". :)

In fact usually it's very easy to notice a person who lived abroad for a long time (even if his/her native language is Russian and he/she speaks in English with Russain accent). Most of these people...

100%. Очень часто это замечаю!
Even (many) adults (!) after spending 4-7 years abroad start speaking with a very noticable accent. So I'm almost sure that the said child would speak in Russian with...

I think the child would speak with an American accent (and his Russian would have traces of the American accent as well).