I'm with Allan C and Steve on this: she is surely far more British than Canadian after spending 16 of her 18 years here, no matter where she was born, what her citizenship, or the nationality of her parents! Of course she may celebrate some of their traditions and customs. As for calling her "Our Emma", yes it's a term of endearment, just as "Oor Wullie" in Scotland is a favourite cartoon character, and belongs to everyone who wants to claim him as theirs.
My brother-in-law moved to Canada in his 20s, took Canadian citizenship about 20 years later, and is now in his 70s: he is definitely far more Canadian than Emma!