She's shown very little innate sense of style or fashion so far, so she'd better be using a stylist, and that stylist should be fired stat! She's either worn boring things in boring colors, over-priced and not attractive dresses, sloppily fitting clothing and shoes, and 'theme' dressing to match the pony on one engagement and the Irish Nationalist flag colors on a trip to NI.
Her hair is always a mess, etc. etc.
Regarding giving her a chance, I think she's had lots of chances and so far she shows no inkling that she's not impressing. Her job is going to be representing the Crown, if she can't learn how to do it correctly then she needs to seek advise. And if the advise she is getting is not working, she needs to keep looking. Really, it's not rocket science!