The order of precedence accorded to women of the royal family differs depending on whether or not they are accompanied by a husband who is accorded higher precedence. When unaccompanied, blood relations of the sovereign are always accorded higher precedence. For example, when not accompanied by Prince Charles, Camilla ranks after Princess Alexandra; when with her husband, Camilla ranks above all women other than the reigning sovereign and any queens dowager.
Camilla
Princess Alexandra