No., she's 10 and will be 11 in December, but nevertheless, you are right, she looks older and much more "developed", like 13 or 14.
I'd put her at older than that (14) from the photos - but the clothes and watch and jewellery etc belong to someone many years older than 10 IMO - compare her to the Spanish princesses or those from Netherlands, or even Elizabeth from Belgium who is 16 or 17 now, or Lady Louise Windsor who is several years older at 14. It must be hard being a child but in a world where something different is the reality