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When you see her on Des and Mel she has a naturally stron Oldham (pardon me) accent, irritating because of her, not the accent btw.
I very much doubt she can alter her accent to talk Sloane, especially as she is a model and not a trained actress. Unless she has hidden depths I never knew about. At least they didn't dub it as an American...
I doubt you can hydrate skin, the layers concerned are far too deep to affect with cream and anything taken orally would probably be rather too severe.