i don't think DoC has any extensions, the way her hair is blow-dried now is much more different ,less straighter at the top with more volume and and looser curls.
i used to get my hair blow-dried regularly when we still lived in paris, the street we lived in had actually two well known hair salons, and i used to pop in regularly .Oh it was heavenly, the most indulgent and relaxing experience. Having someone take care of your hair. Treatment,masks and blowdry, i couldn't have managed to do it myself with 2 small dcs hanging around my legs in less than thirty minutes. my hair always looked big and bouncy.
sadly i couldn't find a good place near me in London that did not give me the hair of a news reader.
regarding royals and plastic surgeries /fillers . you can't control the press pictures and sometimes you have a bad profile, good/bad angles and having nose job or chin surgery can make a huge difference, in appearance and confidence.
many royals had some work done but i was quite surprised by Letizia, i think i prefer her old nose . Queen Rania had lots of work done over the years. I think its very good, looks natural.
i think MM nose job is probably one of the best I've seen. Barely noticeable .