They certainly don't want to be drawing comparisons with the star-studded Diana and Charles visit in 1985,
She knows exactly how to handle Charles. She 'mummies' him and makes sure to never outshine him like Diana did.
Diana had the combination of status and sex appeal which made her more starry than a movie star. Camilla scrubs up well but it takes an army of make-up artists and dress designers. Diana had it naturally.