grammaticality - Is it grammatically correct to shift an appositive away from the noun it renames or describes?


I'm taking a semester in London. Here's a sample of something I keep hearing:



John: My mum will be here later?


Susan: Is she staying for supper, your mum?



If Susan wishes to say, "your mum," why can't she just ask:



Is your mum staying for dinner?



Or, if Susan wants to clarify who that she in her sentence is (for which, in my opinion, there is absolutely no need), why doesn't she just say:



"Is she, your mum, staying for dinner?"



Is there anything in grammar that allows for putting an appositive not immediately next to what it's describing?


If so, how is it justified?




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