She is a part of the elite, preppy bon chic bon genre (BCBG). Very uppity middle-class, equestrian life with a slight hint of bourgeois. Peter York and Ann Barr collaborated to bestow upon you the grand Official Sloane Ranger Handbook. They were often seen in high society London wearing Hermès or Liberty silk head scarves distinctively tied just below the chin (see images above).
A grown man boy who receives an allowance from his rich parents. And if by chance he has a bad case of the crazies (they usually do), they will get him the hell out of their crib and just send him a check. For the sake of the family dogs, it's best to keep him and his crazy away.