It seems you're combining two popular cultural references. "Mirandy" is not directly associated with either of these.
However, I believe you might be referring to a mix of 'Mandy' and 'Miranda', and 'The Devil Wears Prada'.
Mandy Moore played the role of Miranda Priestly's personal assistant, Andy Sachs, in the film adaptation of 'The Devil Wears Prada', but her name is not Miranda. It is Miranda Priestly, played by Meryl Streep.
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